|
| |
Back to Contents Page
Solving Problems: Dell™ OptiPlex™ GX150 System User's Guide
This section describes system and software problems, offers corrective actions,
describes the utility, and provides system messages and codes. Before you call Dell for
technical assistance, complete the following tasks to help you resolve computer problems:
Read "About Your Computer" and "Safety Information."
Take the problem-solving action listed in the following table for the component or
equipment that is malfunctioning.
Basic Checks:
- Test the electrical outlet: ensure that the electrical outlet is working by testing it
with another device such as a lamp.
- Connect the computer power cable directly to an electrical outlet: bypass power
protection devices, power strips, and extension cords to verify that the computer turns
on.
- Check for interference: electrical appliances on the same circuit or operating in close
proximity to the computer can cause interference.
If the problem still exists after you complete the basic checks, fill out the
Diagnostics Checklist as you perform the following steps:
- Turn off the computer and peripherals, and disconnect them from their electrical
outlets.
- If you are using a surge protector, remove it.
- Make sure the power cable is firmly connected to the computer, and then verify that the
power cable is directly connected to the electrical outlet.
- Turn on the computer.
Does the power indicator LED on the front of the computer light up?
Yes. The problem is resolved.
No. The computer may be defective. Contact Dell for technical assistance.
Basic Checks:
- If the monitor power indicator does not light, check the power connection.
- If the external monitor is blank, the computer may be in suspend or hibernate mode. To
resume normal operation, press the power button.
- Disconnect the monitor cable from the computer and check the cable connector for bent or
broken pins. Check for damaged or frayed cables.
- If the cable is not damaged, make sure that it is firmly connected to the computer.
- Test the electrical outlet. Verify that the device is connected to a working electrical
outlet. Verify that the device is turned on.
- Check for interference: electrical appliances on the same circuit or operating in close
proximity to the computer can cause interference.
- Adjust brightness and contrast settings on the monitor.
- Reinstall the video driver for your operating system.
- Restart the computer.
If the problem still exists after you complete the basic checks, fill out the
Diagnostics Checklist as you perform the following steps:
- Turn off the computer, wait at least 30 seconds, and then turn the computer back on.
- Allow 1 minute for the computer to initialize its components, and then adjust the
monitor's brightness and contrast controls.
Is the monitor readable?
Yes. The problem is resolved.
No. Go to step 3.
- Turn off nearby fans, lights, lamps, or other electrical devices.
Is the monitor readable?
Yes. One or more of those devices was causing interference. The problem is
resolved.
No. Go to step 4.
- Enter system setup and make sure that Primary Video Controller under the Integrated
Devices option is set correctly. Then exit system setup properly to save the
information, and reboot the system.
For an AGP expansion card, set Primary Video Controller to AGP; for an
integrated video controller (a chip on the system board), set Primary Video Controller to
Onboard; for a PCI expansion card, set Primary Video Controller to Auto.
Is the device working properly?
Yes. The problem is resolved.
No. Go to step 5.
- Run the VESA/VGA Interface tests in the Dell Diagnostics.
Did any of the tests fail?
Yes. The video controller on the system board may be defective. Contact Dell for
technical assistance.
No. Go to step 6.
- Turn off the computer and the monitor, connect another monitor to the computer, and then
turn them on.
If you do not have another monitor, contact Dell for technical assistance.
- Allow one minute for the computer to initialize its components, and then adjust the
monitor's brightness and contrast controls.
Is the monitor readable?
Yes. The original monitor is defective. The problem is resolved.
No. Contact Dell for technical assistance.
Basic Checks:
- If using external speakers:
- Make sure that the speaker cables are firmly connected to the computer.
- Test the electrical outlet: verify that the speakers are connected to a working
electrical outlet.
- Ensure that the speakers are turned on.
- If using a sound card, make sure external audio devices are connected to the sound
card’s connectors and not to the microphone, line-out, or line-in connectors on the
system's front or back panels.
- Adjust the volume.
- Reinstall the audio driver for your operating system.
- Check for interference: electrical appliances on the same circuit or operating in close
proximity to the computer can cause interference.
If the problem still exists after you complete the basic checks, fill out the
Diagnostics Checklist as you perform the following steps:
- Turn off nearby fans, lights, lamps, or other electrical devices.
Are the external speakers functioning properly?
Yes. One or more of those electrical devices was causing interference. The
problem is resolved.
No. Go to step 2.
- Enter system setup and make sure that Sound under the Integrated Devices
option is set to On. Then exit system setup properly to save the information, and
reboot the system.
Is the device working properly?
Yes. The problem is resolved.
No. Go to step 3.
- Run the Misc. PCI Devices tests in the Dell Diagnostics.
Did the tests complete successfully?
Yes. The controller is functioning properly. If the problem persists,
contact Dell for technical assistance.
No. Contact Dell for technical assistance.
Basic Checks:
- Disconnect the cable from the computer and check the cable connector for bent or broken
pins. Check for damaged or frayed cables.
- If the cable is not damaged, make sure that it is firmly connected to the computer.
- Test the electrical outlet: verify that the printer is connected to a working electrical
outlet.
- Ensure that the printer is turned on.
- Check for interference: electrical appliances on the same circuit or operating in close
proximity to the computer can cause interference.
If the problem still exists after you complete the basic checks, fill out the
Diagnostics Checklist as you perform the following steps:
- Perform the procedure in "Serial or Parallel Device Problems."
Is the device working properly?
Yes. The problem is resolved.
No. Go to step 2.
- Run the printer's self-test.
Does the self-test complete successfully?
Yes. Go to step 3.
No. The printer is probably defective. If you bought the printer from Dell,
contact Dell for technical assistance. If you did not, take it to an authorized service
center for repair.
- Try to print again.
Does the print operation complete successfully?
Yes. The problem is resolved.
No. Contact Dell for technical assistance.
If a system error message indicates a port problem or if equipment connected to a port
seems to perform incorrectly or not at all, the source of the problem can be any of the
following:
- A faulty connection between the I/O port and the device
- Incorrect settings for system setup options
- Incorrect settings in the operating system's configuration files
- A faulty cable between the I/O port and the device
- A faulty device
- Faulty I/O port logic on the system board
- Conflicting COM port settings
- Lack of drivers
Basic Checks:
- Disconnect the cable from the computer and check the cable connector for bent or broken
pins. Check for damaged or frayed cables.
- If the cable is not damaged, make sure that it is firmly connected to the computer.
- Test the electrical outlet. Verify that the device is connected to a working electrical
outlet.
- Verify that the device is turned on.
- Check for interference: electrical appliances on the same circuit or operating in close
proximity to the computer can cause interference.
If the problem still exists after you complete the basic checks, fill out the
Diagnostics Checklist as you perform the following steps:
- Enter system setup and check the Integrated Devices option settings. Then exit
system setup properly to save the information, and reboot the system.
For a serial device, check the Serial Port options; for a parallel device, check
the Parallel Port options. See the device’s documentation for additional
information on port settings and configuration requirements.
Is the device working properly?
Yes. The problem is resolved.
No. Go to step 2.
- Run the Serial Ports device group and/or the Parallel Ports device group
in the Dell Diagnostics.
These device groups check the basic functions of the system board's I/O port logic. If
a printer is connected to the parallel port, the Parallel Ports device group tests
the communication link between the system board's I/O port logic and the printer.
Do the tests complete successfully?
Yes. Go to step 3.
No. Contact Dell for technical assistance.
- If the problem is confined to a particular application program, see the application
program's documentation for specific port configuration requirements.
Is the device working properly?
Yes. The problem is resolved.
No. Go to step 4.
- Turn off the computer and the device, swap the device's cable with a known working
cable, and then turn on the computer and the device.
Is the device working properly?
Yes. You need a new device cable. Contact Dell for technical assistance.
No. Go to step 5.
- Turn off the computer and the device, swap the device with a comparable working device,
and then turn on the computer and the device.
Is the device working properly?
Yes. You need a new device. Contact Dell for technical assistance.
No. Contact Dell for technical assistance.
Basic Checks:
- Disconnect the cable from the computer and check the cable connector for bent or broken
pins. Check for damaged or frayed cables.
- If the cable is not damaged, make sure that it is firmly connected to the computer.
- Reinstall the mouse driver for your operating system.
- Restart the computer.
If the problem still exists after you complete the basic checks, fill out the
Diagnostics Checklist as you perform the following steps:
- If you are using a PS/2 mouse, enter system setup and make sure that Mouse Port
under the Integrated Devices option is set to On. Then exit system setup
properly to save the information, and reboot the system.
Is the device working properly?
Yes. The problem is resolved.
No. Go to step 2.
- If you are using a PS/2 mouse, run the Mouse test in the Pointing Devices
device group in the Dell Diagnostics.
Did the tests complete successfully?
Yes. Go to step 3.
No. Contact Dell for technical assistance.
- Turn off the computer, connect another mouse to the computer, and then turn the computer
on.
If you do not have another mouse, contact Dell for technical assistance.
Is the mouse functioning properly?
Yes. The original mouse is defective. The problem is resolved.
No. Contact Dell for technical assistance.
Basic Checks:
- Disconnect the cable from the computer and check the cable connector for bent or broken
pins. Check for damaged or frayed cables.
- If the cable is not damaged, make sure that it is firmly connected to the computer.
- Check for interference. Keyboard extension cables can cause problems.
- Restart the computer.
If the problem still exists after you complete the basic checks, fill out the
Diagnostic Checklist as you perform the following steps:
- Turn off the computer, and then disconnect the keyboard cable and check it for bent or
broken pins.
Do you see bent pins?
Yes. If they can be straightened, straighten them and go to step 2. If they
cannot be straightened or are broken, you must replace the keyboard.
No. Go to step 2.
- Reconnect the keyboard to the computer.
Make sure the keyboard cable is firmly connected to computer.
- Turn on the computer.
- If you are using a keyboard that can be configured with various switch settings, make
sure the switch is set to PS/2, Enhanced XT/AT, or PC/AT.
The switch settings are usually on the bottom of the keyboard, sometimes behind a
panel. Refer to the documentation that came with the keyboard for more information.
- Turn off the computer, wait 30 seconds, and turn it on again.
During the boot routine, do the Num Lock, Caps Lock, and Scroll Lock lights on the
keyboard blink momentarily?
Yes. Go to step 6.
No. Go to step 7.
- Use the keyboard to type some characters.
Do the characters appear on the screen?
Yes. The problem is resolved.
No. Contact Dell for technical assistance.
- Run the PC-AT Compatible Keyboards tests in the Dell Diagnostics.
Did any of the diagnostics tests fail?
Yes. The original keyboard may be defective. Go to step 8.
No. Go to step 8.
- Turn off the computer, connect another keyboard to the computer, and then turn the
computer on.
If you do not have another keyboard, contact Dell for technical assistance.
Is the keyboard functioning properly?
Yes. The original keyboard is defective. The problem is resolved.
No. Contact Dell for technical assistance.
Diskette Drive Problems
During the power-on self-test (POST), the computer checks the diskette drive, comparing
its characteristics with the system configuration information. The diskette-drive access
light blinks as the computer performs this check.
Basic Checks:
- If you hear an unfamiliar scraping or grinding sound when a drive is accessed, there
could be a hardware malfunction. Contact Dell for technical assistance.
- When you turn on the computer, you can hear drive activity during the boot routine. If
your computer does not boot, contact Dell for technical assistance.
- If you are trying to copy data to the diskette, make sure that it is not
write-protected.
- Try a different diskette in the drive. If the new diskette works, the original one may
be defective.
- Test the diskette drive access indicator by using one of the following methods:
- Using MS-DOS®, insert a diskette into the drive, type dir a:
at the DOS prompt, and press <Enter>.
- Using Microsoft® Windows® or Windows NT®, insert a diskette into the drive, open My
Computer from the desktop, and double-click the diskette drive icon.
- Check the settings in system setup.
- Clean the drive using a commercially available cleaning kit.
NOTICE: Do not attempt to clean drive heads with a swab. You may accidentally
misalign the heads, rendering the drive inoperable.
If the problem still exists after you complete the basic checks, fill out the
Diagnostics Checklist as you perform the following steps.
- Run the Diskette device group in the Dell Diagnostics.
Did any of the tests fail?
Yes. Contact Dell for technical assistance.
No. Go to step 2.
- Turn off the computer and peripherals, disconnect them from their electrical outlets,
wait at least 5 seconds, and then open the computer cover.
- Remove and reinstall the diskette drive.
- Close the computer cover, reconnect the computer and peripherals to their electrical
outlets, and turn them on.
Does the diskette-drive access light blink during the boot routine?
Yes. Go to the next question.
No. Contact Dell for technical assistance.
Does the computer display a drive error message?
Yes. See "System Messages" for an
explanation of the message, and then go to step 5.
No. The problem is resolved.
- Insert a bootable diskette into the diskette drive and reboot the computer.
Does the drive boot the operating system?
Yes. The problem is probably resolved. If you continue to experience trouble,
contact Dell for technical assistance.
No. Contact Dell for technical assistance.
Hard Drive Problems
Basic Checks:
- If you hear an unfamiliar scraping or grinding sound when a drive is accessed, there
could be a hardware malfunction. Contact Dell for technical assistance.
- When you turn on the computer, you can hear drive activity during the boot routine. If
your computer does not boot, contact Dell for technical assistance.
- Test the hard drive by using one of the following methods:
- For Windows XP and Windows 2000, run the chkdsk utility by clicking
the Start button, selecting Run, and then typing cmd in the dialog box. At the C: prompt, type chkdsk and press <Enter>.
This utility creates and displays a status report, and lists and
corrects errors on the disk.
- For Windows NT, run the error-checking utility by double-clicking My
Computer and selecting the hard drive that you want to check. Click the right
mouse button, select Properties, then click Tools, and
select Check Now in the Error Checking section.
- For Windows 98 SE and Windows 98, run the ScanDisk utility by
clicking the Start button, pointing to Run, typing scandskw in the dialog box, selecting the
type of test to run, and then clicking Start.
- For MS-DOS, type scandisk x: at an MS-DOS prompt, where x is the hard drive letter, and press <Enter>.
If the problem still exists after you complete the basic checks, fill out the
Diagnostic Checklist as you perform the following steps:
- Enter system setup and make sure the problem drive is configured correctly. Make any
necessary changes, and reboot the system.
Is the drive operating properly?
Yes. The problem is resolved.
No. Proceed to step 2.
- Test the hard drive by using one of the following methods:
- For Windows XP and Windows 2000, run the chkdsk utility by clicking
the Start button, selecting Run, and then typing cmd in the dialog box. At the C: prompt, type chkdsk and press <Enter>.
This utility creates and displays a status report, and lists and
corrects errors on the disk.
- For Windows NT, run the error-checking utility by double-clicking My
Computer and selecting the hard drive that you want to check. Click the right
mouse button, select Properties, then click Tools, and
select Check Now in the Error Checking section.
- For Windows 98 SE and Windows 98, run the ScanDisk utility by
clicking the Start button, pointing to Run, typing scandskw in the dialog box, selecting the
type of test to run, and then clicking Start.
- For MS-DOS, type scandisk x: at an MS-DOS prompt, where x is the hard drive letter, and press <Enter>.
Is the drive operating properly?
Yes. The problem is resolved.
No. Proceed to step 3.
- Run the appropriate test group in the Dell Diagnostics:
- For an IDE hard drive, run the IDE Devices device group.
- For a SCSI hard drive, run the SCSI Devices device group.
Did any of the diagnostics tests fail?
Yes. Go to the next question.
No. Proceed to step 4.
Did any of the diagnostics tests indicate a faulty drive?
Yes. The hard drive may be faulty. Contact Dell for technical assistance.
No. Go to the next question.
Did any of the diagnostics tests indicate a faulty drive controller?
Yes. The system board may be faulty. Contact Dell for technical assistance.
No. Proceed to step 4.
- Turn off the computer and peripherals, disconnect them from their electrical outlets,
wait at least 5 seconds, and then open the computer cover.
- Make sure the DC power cables from the power supply are firmly connected to the
connectors on each drive. Also verify that the interface cable for each drive is firmly
connected to the drive and to the system board.
- Make sure the control panel cable is firmly connected to the system board. The control
panel contains the hard drive activity LED. To locate the control panel system board
connector, see the system board.
- Close the computer cover, reconnect the computer and peripherals to their electrical
outlets, and turn them on.
Does the hard drive activity light blink during the boot routine?
Yes. Go to the next question.
No. The system board may be faulty. Contact Dell for technical assistance.
Does the computer display a drive error message?
Yes. See "System Messages" for an
explanation of the message. If you cannot correct the problem by performing the action
described in the table, then contact Dell for technical assistance.
No. Go to the next question.
Is this the primary hard drive that contains the operating system?
Yes. Go to the next question.
No. Contact Dell for technical assistance.
Does the drive boot the operating system?
Yes. Go to the next question.
No. Files in the operating system may be corrupt. See your operating system
documentation.
Is the drive operating properly?
Yes. The problem is resolved.
No. Contact Dell for technical assistance.
If an error message indicates a problem with the battery or if configuration
information is lost from system setup when the computer is turned off, the battery may be
defective.
 |
CAUTION: There is a danger of a new battery
exploding if it is incorrectly installed. Replace the battery only with the same or
equivalent type recommended by the manufacturer. Discard used batteries according to the
manufacturer's instructions. |
|
CAUTION: Before you perform this procedure,
see "Safety Information." |
- Turn off the computer and peripherals, disconnect them from their electrical outlets,
wait at least 5 seconds, and then open the computer cover.
- Reseat the battery in its socket with the side labeled "+" facing up.
- Close the computer cover, reconnect the computer and peripherals to their electrical
outlets, and turn them on.
- Enter system setup and reenter the current time and date. Then exit system setup
properly to save the information.
- Turn off your computer and disconnect it from its electrical outlet. Leave the computer
off for at least 10 minutes.
- Reconnect the computer to its electrical outlet and turn it on.
- Enter system setup, and check the date and time.
Are the date and time correct?
Yes. The problem is resolved.
No. The battery may be defective. Proceed to step 8.
- Replace the battery.
Is the battery working properly?
Yes. The problem is resolved.
No. You may have a faulty system board. Contact Dell for technical assistance.
If an error message indicates an expansion card problem or if an expansion card seems
to perform incorrectly or not at all, the problem could be a faulty connection, a conflict
with software or other hardware, or a faulty expansion card.
Fill out the Diagnostics Checklist as you perform the following steps.
- Turn off the computer and peripherals, disconnect them from their electrical outlets,
wait at least 5 seconds, and then open the computer cover.
- If you have a mini tower chassis, remove the AGP card brace.
- Make sure each expansion card is firmly seated in its connector. If any expansion cards
are loose, reseat them.
- Make sure all cables are firmly connected to their corresponding connectors on the
expansion cards. If any cables appear loose, reconnect them.
For instructions on which cables should be attached to specific connectors on an
expansion card, see the expansion card's documentation.
- If you have a mini tower chassis, replace the AGP card brace.
- Close the computer cover, reconnect the computer and peripherals to their electrical
outlets, and turn them on.
Is the system working properly?
Yes. The problem is resolved.
No. You may have a faulty expansion card. Proceed to step 7.
- Turn off the computer and peripherals, disconnect them from their electrical outlets,
wait at least 5 seconds, and then open the computer cover.
- Remove all expansion cards except the video card.
 |
NOTE: If your primary hard drive is connected to a drive
controller card and not one of the system board EIDE connectors, leave the drive
controller card installed in the computer. |
- Close the computer cover, reconnect the computer and peripherals to their electrical
outlets, and turn them on.
- Run the RAM test group in the Dell Diagnostics.
Did any of the diagnostics tests fail?
Yes. Contact Dell for technical assistance.
No. Proceed to step 11.
- Turn off the computer and peripherals, disconnect them from their electrical outlets,
wait at least 5 seconds, and then open the computer cover.
- Reinstall one of the expansion cards that you removed previously, and repeat steps 9 and
10.
Did any of the diagnostics tests fail?
Yes. The expansion card you just reinstalled is faulty and needs to be replaced.
No. Repeat steps 11 and 12 with another expansion card. Proceed to step
13.
- If you have replaced all the expansion cards and the problem is not resolved, contact
Dell for technical assistance.
- Press <Ctrl><Alt><Delete>.
- The Close Program window appears.
- Click the program that no longer responds.
- Click End Task.
- Press and hold the power button until the computer turns off.
- Press the power button to turn on the computer.
Spills, splashes, and excessive humidity can cause damage to the system. If an external
device, such as a printer or modem, gets wet, contact the manufacturer of the device for
instructions.
Fill out the Diagnostics Checklist as you perform the following steps:
- Turn off the computer and peripherals, disconnect them from their electrical outlets,
wait at least 5 seconds, and then open the computer cover.
- Let the computer dry for at least 24 hours. Make sure that it is thoroughly dry before
you proceed.
- If you have a small mini-tower chassis, remove the AGP card brace.
- Remove all expansion cards installed in the computer except a video expansion card.
|
NOTE: If your primary hard drive is connected to a drive
controller card and not one of the system board EIDE connectors, leave the drive
controller card installed in the computer. |
- Close the computer cover, reconnect the computer and peripherals to their electrical
outlets, and turn them on.
Does the system have power?
Yes. Proceed to step 6.
No. Contact Dell for technical assistance.
- Turn off the computer and peripherals, disconnect them from their electrical outlets,
wait at least 5 seconds, and then open the computer cover.
- Reinstall all expansion cards.
- If you have a micro tower chassis, replace the AGP card brace.
- Close the computer cover, reconnect the computer and peripherals to their electrical
outlets, and turn them on.
- Run the System Board Devices test group in the Dell Diagnostics.
Did any of the diagnostics tests fail?
Yes. Contact Dell for technical assistance.
No. The problem is resolved.
Fill out the Diagnostic Checklist as you perform the following steps:
- Turn off the computer and peripherals, disconnect them from their electrical outlets,
wait at least 5 seconds, and then open the computer cover.
- Check all the expansion-card connections in the computer, and reseat any loose expansion
cards.
- Make sure that all cables are properly connected and that all components are properly
seated in their connectors and sockets.
- Close the computer cover, reconnect the computer and peripherals to their electrical
outlets, and turn them on.
- Run the System Board Devices test group in the Dell Diagnostics.
Did any of the diagnostics tests fail?
Yes. Contact Dell for technical assistance.
No. The problem is resolved.
Hardware conflicts occur when the operating system detects multiple devices that are
attempting to operate on the same system resources when those resources cannot be shared
between the devices.
Symptoms:
- System hangs or locks up, particularly while using a specific device.
- Memory parity errors occur on parity-enabled systems.
- Noise or other problems from sound cards.
- Unintelligible characters printed on the printer.
- Mouse pointer hangs and will not move or moves in a stuttering fashion.
- Messages stating that the computer is not operating at maximum performance.
- Errors and crashes of applications for no apparent reason.
- Nothing displays on the video monitor.
To resolve hardware conflicts, remove any newly added hardware and contact the hardware
manufacturer. Also see your operating system documentation.
During POST, the computer checks the computer's memory, determines the amount of
installed memory, and then writes to and reads from the number of available bytes to
ensure proper operation.
Basic Checks:
- If an insufficient memory message appears, save and close any open files and exit any
open application programs not in use.
- Consider installing additional system memory.
- Run the System Memory test in the Dell Diagnostics.
- Reseat the memory modules.
- Restart the computer.
If the problem still exists after you complete the basic checks, fill out the
Diagnostic Checklist as you perform the following steps.
- Reboot the computer.
Does the RAM count displayed correctly match the actual amount of memory installed in
the computer?
Yes. The computer needed to update the memory count. The problem is resolved.
No. Go to step 2.
- Run the System Memory test group in the Dell Diagnostics.
Did any of the diagnostics tests fail?
Yes. Contact Dell for technical assistance.
No. Go to step 3.
- Turn off the computer and peripherals, disconnect them from their electrical outlets,
wait at least 5 seconds, and then open the computer cover.
- Rotate the power supply away from the system board.
- Replace the memory module(s).
- Close the computer cover, reconnect the computer and peripherals to their electrical
outlets, and turn them on.
Does the RAM count displayed correctly match the actual amount of memory installed in
the computer?
Yes. The memory module(s) were defective. The problem is resolved.
No. Contact Dell for technical assistance.
A system board problem can result from a defective system board component, a faulty
power supply, or a defective component connected to the system board. If an error message
indicates a system board problem, fill out the Diagnostic Checklist as you perform the
following steps.
- Reboot the system and run the System Board Devices test group in the Dell
Diagnostics.
Did any of the tests fail?
Yes. Contact Dell for technical assistance.
No. Go to step 2.
- Turn off the computer and peripherals, disconnect them from their electrical outlets,
wait at least 5 seconds, and then open the computer cover.
- Make sure the power cables from the power supply are firmly connected to the connectors
on the system board.
- Close the computer cover, reconnect the computer and peripherals to their electrical
outlets, and turn them on.
Is the computer working properly?
Yes. The problem is resolved.
No. Go to step 5.
- Perform the procedure in "Expansion Card Problems."
Is the computer working properly?
Yes. The problem is resolved.
No. Go to step 6.
- Perform the procedure in "Keyboard Problems."
Is the computer working properly?
Yes. The problem is resolved.
No. Go to step 7.
- Perform the procedure in "Resetting a Damaged
System Board."
Is the computer working properly?
Yes. The problem is resolved.
No. Contact Dell for technical assistance.
If the system cannot boot and you have exhausted all other troubleshooting options,
perform the following steps.
- Turn off the computer and peripherals, disconnect them from their electrical outlets,
wait at least 5 seconds, and then open the computer cover.
- If you have a micro tower chassis, remove the AGP card brace.
- Install a jumper plug on the RTCRST jumper pins and then remove it.
- Replace the AGP card brace.
- Close the computer cover, reconnect the computer and peripherals to their electrical
outlets, and turn them on.
Is the computer working properly?
Yes. The problem is resolved.
No. Contact Dell for technical assistance.
When to Use the Dell Diagnostics
If you experience a problem with your computer, run the Dell Diagnostics before you
call Dell for technical assistance. The Dell Diagnostics tests check your computer's
hardware without additional equipment and without the risk of destroying data. When the
diagnostics tests complete without indicating any problems, you can have confidence in
your computer's operation. If the tests indicate a problem you cannot solve by yourself,
the test results provide important information you will need when talking to Dell's
service and support personnel.
NOTICE: Only use the Dell Diagnostics to test your Dell computer. Using this
program with other computers may cause incorrect computer responses or result in error
messages.
Features
The diagnostic test groups features allow you to take the following actions:
- Perform quick checks or extensive tests on one or all devices
- Choose the number of times a test group or subtest is repeated
- Display or print test results or save them in a file
- Suspend testing if an error is detected or terminate testing when an adjustable error
limit is reached
- Access online Help screens that describe the tests and tell how to run them
- Read status messages that inform you whether test groups or subtests completed
successfully
- Receive error messages that appear if problems are detected
Before You Start Testing
- Read "Safety Information."
- Turn on your printer if one is attached, and make sure it is online.
- Enter system setup, confirm your computer's system configuration information, and enable
all of its components and devices, such as ports.
|
NOTE: Dell recommends that you print these procedures
before you begin. For additional information, refer to the Dell OptiPlex User's Guide,
located on the Dell OptiPlex ResourceCD. |
- Shut down and restart the computer.
- Enter system setup.
- Change the Boot Sequence to use the CD drive as the first device in the boot
sequence.
|
NOTE: Write down your current boot sequence in case you
want to restore it after running the Dell Diagnostics. |
- Insert the Dell OptiPlex ResourceCD into the CD drive.
- Press <Alt><b> to exit system setup and save your changes.
The computer reboots and the Dell logo screen appears followed by a list of the
available languages.
|
NOTE: If you are starting the ResourceCD for the first
time on this computer, the ResourceCD Installation window opens to inform you that
the ResourceCD is about to begin installation. Click OK to continue. To complete
the installation, respond to the prompts offered by the installation program. If the Welcome
Dell System Owner screen opens, click Next to continue. |
- Select Start computer to run Dell Diagnostics.
- Select the number for the language that you want.
- A numbered list displays the following options:
- Option 1 – Dell Diagnostics — Loads the Dell Diagnostics that run
computer tests
- Option 2 – Exit
— Exits the main menu and returns to an MS-DOS prompt.
- Select Option 1 — Dell Diagnostics. After the diagnostics
initialize, the Dell Diagnostics main menu appears:
Dell Diagnostics Main Menu
- Test All Devices: Performs quick or extensive tests on all devices.
- Test One Device: Performs quick or extensive tests on a single device after you
select it from a list of device groups. After you select Test One Device, press
<F1> for more information about a test.
- Advanced Testing: Allows you to modify the parameters of a test, select a group
of tests to perform, and access additional information about Advanced Testing.
- Information and Results: Provides test results, test errors, version numbers of
subtests, and additional information on the Dell Diagnostics.
- Program Options: Allows you to change the settings of the Dell Diagnostics.
- Exit to MS-DOS: Exits to the MS-DOS prompt.
- Select the type of tests to perform:
- To perform a quick check of your computer or a specific device, select Quick Tests
from the Test All Devices or Test One Device option.
Quick Tests runs only the tests that run fast and do not require user
interaction. Dell recommends that you choose Quick Tests first to increase the odds
of tracing the source of the problem quickly.
- For a thorough check of your computer or to check a particular area of your computer,
select Extended Tests from the Test All Devices or Test One Device
option.
- To customize your test(s), select the Advanced Testing option.
- Remove the ResourceCD from the CD drive when you have finished running the Dell
Diagnostics.
- Enter system setup and change the Boot Sequence to your original configuration.
Advanced Testing
When you select Advanced Testing from the Diagnostics Menu, the following screen
appears:
|
NOTE: The groups and devices listed in your screen can
vary somewhat based on the components installed in your computer. |
Information in the Advanced Testing screen is presented as follows:
- Device Groups — lists the diagnostic test groups in the order they will run
if you select All from the Run tests menu option.
To select a test device group, press the up- or down-arrow key to highlight the group.
|
NOTE: The diagnostics may not list in the Device
Groups area the names of all components or devices that are part of your computer
system. For example, it may not list a printer even though it is connected to your
computer. However, the parallel port to which the printer is connected appears in the Device
Groups list. You can test your printer connection in the Parallel Ports tests. |
- Devices for Highlighted Group — lists the computer's current hardware.
- Device groups menu bar — contains the options Run tests, Devices,
Select, Config, and Help.
To select a menu option, press the left- or right-arrow key to highlight the option and
press <Enter>, or press the key that corresponds to the highlighted letter in the
category title.
|
NOTE: The options displayed on your screen should reflect
the hardware configuration of your computer. |
Advanced Testing Help Menu
The Help options and a description of their functions are presented in
the following table.
| Help Option |
Description |
| Menu |
Describes the Advanced Testing
screen, the Device Groups, and the diagnostic menus and commands and
gives instructions on how to use them |
| Keys |
Explains the functions of all keystrokes that can be used in the Dell
Diagnostics |
| Device Group |
Describes the highlighted group in the Device Groups list
on the main menu and provides reasons for using certain tests |
| Device |
Describes the highlighted device in the Device Groups
list on the Advanced Testing screen |
| Test |
Describes the test procedure for each highlighted test group subtest |
| Versions |
Lists the version numbers of the subtests |
Your application programs, operating system, and the computer itself
are capable of identifying problems and alerting you to them. When a problem occurs, a
message may appear on your monitor screen or a beep code may sound. See "System Messages" or "System
Beep Codes" for information about each message or beep code.
If you receive a system message, see the table below for suggestions
on resolving any problems indicated by the message. The system messages are listed
alphabetically.
|
NOTE: If
the system message you received is not listed in the table, check the documentation for
the application program that you were running at the time the message appeared and/or the
operating system documentation for an explanation of the message and a recommended action. |
| Message |
Cause |
Action |
| Address mark not found |
The basic input/output system (BIOS) found a faulty
disk sector or could not find a particular disk sector. |
See "Drive Problems." |
| Alert! Previous attempts at booting this system
have failed at checkpoint [nnnn]. For help in resolving this problem, please note
this checkpoint and contact Dell Technical Support. |
The system has failed to complete the boot routine
three consecutive times for the same error. |
See "Getting Help"
for instructions on obtaining technical assistance, and report the checkpoint code (nnnn)
to the support technician. |
| Attachment failed to respond |
The diskette drive or hard drive controller cannot
send data to the associated drive. |
See "Drive Problems." |
| Bad command or file name |
The command for file name you entered does not exist
or is not in the pathname you specified. |
Make sure you have spelled the command correctly,
placed spaces in the proper location, and used the correct pathname. |
| Bad error-correction code (ECC) on disk read |
The diskette drive or hard drive controller detected
an uncorrectable read error. |
See "Drive Problems." |
| Controller has failed |
The hard drive or the associated controller is
defective. |
See "Drive Problems." |
| Data error |
The diskette or hard drive cannot read the data. |
Run the chkdsk utility in the Microsoft Windows
operating system to check the file structure of the diskette or hard drive. See your
operating system documentation for more information.
If you are using another operating system, run the appropriate utility to check the file
structure of the diskette or hard drive. See your operating system documentation. |
| Decreasing available memory |
One or more dual in-line memory modules (DIMMs) may be
faulty or improperly seated. |
See "System Memory
Problems." |
Diskette drive 0 seek failure
Diskette drive 1 seek failure |
A cable may be loose, or the system configuration
information may not match the hardware configuration. |
See "Drive Problems." |
| Diskette read failure |
A cable may be loose, or the diskette may be faulty. |
See "Drive Problems." |
| Diskette subsystem reset failed |
The diskette drive controller may be faulty. |
Run the Diskette tests in the Dell Diagnostics. |
| Drive not ready |
No diskette is in the drive. The operation requires a
diskette in the drive before it can continue. |
Put a diskette in the drive or close the drive latch. |
| Diskette write protected |
The diskette write-protect feature is activated. |
Remove the diskette from drive A, and move the
write-protect tab to the unlocked position. |
| Gate A20 failure |
One or more DIMMs may be loose. |
See "System Memory
Problems." |
| General failure |
The operating system is unable to carry out the
command. |
This message is usually followed by specific
information—for example, PRINTER OUT OF PAPER. Respond by taking the appropriate action. |
| Hard disk configuration error |
The hard drive failed initialization. |
See "Drive Problems." |
Hard disk controller failure
Hard disk failure
Hard-disk drive read failure |
The hard drive failed initialization. |
See "Drive Problems." |
| Invalid configuration information - please run
SETUP program |
The system configuration information does not match
the hardware configuration. |
Enter system
setup and correct the system configuration information. |
Keyboard clock line failure
Keyboard controller failure
Keyboard data line failure
Keyboard failure
Keyboard stuck key failure |
A cable or connector may be loose, or the keyboard or
keyboard/mouse controller may be faulty. |
See "Keyboard Problems." |
| Memory address line failure at address,
read value expecting value |
One or more DIMMs may be faulty or improperly seated. |
See "System Memory
Problems." |
| Memory allocation error |
The software you are attempting to run is conflicting
with the operating system or another application program or utility. |
Turn off the computer, wait 30 seconds, and then turn
it on. Try to run the program again. If the problem persists, contact the software
company. |
Memory data line failure at address, read
value expecting value
Memory double word logic failure at address, read value expecting value
Memory odd/even logic failure at address, read value expecting value
Memory write/read failure at address, read value expecting value |
One or more DIMMs may be faulty or improperly seated. |
See "System Memory
Problems." |
| Memory size in CMOS invalid |
The amount of memory recorded in the system
configuration information does not match the memory installed in the computer. |
Reboot the computer. If the error appears again, see
"Getting Help" for instructions on obtaining technical
assistance. |
| Memory tests terminated by keystroke |
The memory test was not completed. |
Rerun the memory test. |
| No boot device available |
The computer cannot find the diskette or hard drive. |
Enter system
setup, check the system configuration information for the diskette and hard drive,
and, if necessary, correct the information. |
| No boot sector on hard-disk drive |
The system configuration information in system setup
may be incorrect, or the operating system may be corrupted. |
Enter system
setup, check the system configuration information for the hard drive, and if
necessary, correct the information.
If the problem persists, reinstall your operating system. See the documentation that came
with your operating system. |
| No timer tick interrupt |
A chip on the system board might be malfunctioning. |
Run the System Board Devices tests in
the Dell Diagnostics. |
| Non-system disk or disk error |
The diskette in drive A or your hard drive does not
have a bootable operating system installed on it. |
A nonbootable diskette is in drive A. Either replace
the diskette with one that has a bootable operating system, or remove the diskette from
drive A and restart the computer. |
| Not a boot diskette |
There is no operating system on the diskette. |
Boot the computer with a diskette that contains an
operating system. |
| Plug and Play Configuration Error |
The system has encountered a problem in trying to
configure one or more expansion cards. |
Turn your system off and unplug it. Remove all but one
of the cards. Plug in your system and reboot it. If the problem persists, the expansion
card may be malfunctioning. If the message does not reappear, turn off the power and
reinsert one of the other cards. Repeat this process until you identify the malfunctioning
card. |
Read fault
Requested sector not found |
The operating system cannot read from the diskette or
hard drive. The system could not find a particular sector on the disk, or the requested
sector is defective. |
See "Drive Problems." |
| Reset failed |
The disk reset operation failed. |
See "Drive Problems." |
| Sector not found |
The operating system is unable to locate a sector on
the diskette or hard drive. |
See "Drive Problems." |
| Seek error |
The operating system is unable to find a specific
track on the diskette or hard drive. |
If the error is on the diskette drive, try another
diskette in the drive. |
| Shutdown failure |
A chip on the system board might be malfunctioning. |
Run the System Board Devices tests in
the Dell Diagnostics. |
| Time-of-day clock stopped |
The battery may be dead. |
Enter system
setup and correct the date or time.
If the problem persists, see "Battery Problems." |
| Time-of-day not set |
The time or date displayed in the system configuration
information does not match the system clock. |
Enter system
setup and correct the date or time. |
| Timer chip counter 2 failed |
A chip on the system board might be malfunctioning. |
Run the System Board Devices tests in
the Dell Diagnostics. |
| Unexpected interrupt in protected mode |
The keyboard controller may be malfunctioning, or one
or more DIMMs may be loose. |
Run the System Memory and the Keyboard
tests in the Dell Diagnostics. |
| WARNING: Dell's Disk Monitoring System has
detected that drive [0/1] on the [primary/secondary] EIDE controller is operating outside
of normal specifications. It is advisable to immediately back up your data and replace
your hard-disk drive by calling your support desk or Dell. |
|
Power-on self-test (POST) has queried the enhanced
integrated drive electronics (EIDE) drive for status information. The drive has returned a
parameter from the call that indicates it has detected possible error conditions for its
operating specifications. |
Once your computer finishes booting, immediately back
up your data and replace your hard drive. Restore the data to the replaced drive.
If a replacement drive is not immediately available and the drive is not the only bootable
drive, enter system setup and change the
appropriate drive setting to None. Remove the drive from the system. This should be done
only after you have backed up the data. |
Write fault
Write fault on selected drive |
The operating system cannot write to the diskette or
hard drive. |
See "Drive Problems." |
When errors occur during a boot routine that cannot be reported on
the monitor, your computer may emit a series of beeps that identify the problem. The beep
code is a pattern of sounds: for example, one beep, followed by a second beep, and then a
burst of three beeps (code 1-1-3) means that the computer was unable to read the data in
nonvolatile random-access memory (NVRAM). This information is invaluable to the Dell
support staff if you need to call for technical assistance.
When a beep code is emitted, write it down on a copy of the
Diagnostics Checklist found in "Getting Help," and then
look it up in Table 2. If you are unable to resolve the problem by looking up the meaning
of the beep code, use the Dell Diagnostics to identify a more serious
cause. If you are still unable to resolve the problem, see "Getting
Help" for instructions on obtaining technical assistance.
| Code |
Cause |
Action |
| 1-1-2 |
Microprocessor register failure |
See "Getting Help"
for instructions on obtaining technical assistance. |
| 1-1-3 |
NVRAM |
Run the System Board Devices tests in
the Dell Diagnostics, if possible. |
| 1-1-4 |
ROM BIOS checksum failure |
Run the System Board Devices tests in
the Dell Diagnostics, if possible. |
| 1-2-1 |
Programmable interval timer |
Run the System Board Devices tests in
the Dell Diagnostics, if possible. |
| 1-2-2 |
Direct memory access (DMA) initialization failure |
Run the System Board Devices tests in
the Dell Diagnostics, if possible. |
| 1-2-3 |
DMA page register read/write failure |
Run the System Board Devices tests in
the Dell Diagnostics, if possible. |
| 1-3 |
Video Memory Test failure |
Run the VESA/VGA Interface tests in
the Dell Diagnostics. |
| 1-3-1 through 2-4-4 |
DIMMs not being properly identified or used |
See "System Memory
Problems." |
| 3-1-1 |
Slave DMA register failure |
Run the System Board Devices tests in
the Dell Diagnostics, if possible. |
| 3-1-2 |
Master DMA register failure |
Run the System Board Devices tests in
the Dell Diagnostics, if possible. |
| 3-1-3 |
Master interrupt mask register failure |
See "Getting Help"
for instructions on obtaining technical assistance. |
| 3-1-4 |
Slave interrupt mask register failure |
See "Getting Help"
for instructions on obtaining technical assistance. |
| 3-2-2 |
Interrupt vector loading failure |
See "Getting Help"
for instructions on obtaining technical assistance. |
| 3-2-4 |
Keyboard Controller Test failure |
Run the Keyboard tests in the Dell Diagnostics. Otherwise, see "Getting Help"
for instructions on obtaining technical assistance. |
| 3-3-1 |
NVRAM power loss |
Run the System Board Devices tests in
the Dell Diagnostics, if possible. |
| 3-3-2 |
NVRAM configuration |
Run the System Board Devices tests in
the Dell Diagnostics, if possible. |
| 3-3-4 |
Video Memory Test failure |
Run the VESA/VGA Interface tests in
the Dell Diagnostics. |
| 3-4-1 |
Screen initialization failure |
Run the VESA/VGA Interface tests in
the Dell Diagnostics. |
| 3-4-2 |
Screen retrace failure |
Run the VESA/VGA Interface tests in
the Dell Diagnostics. |
| 3-4-3 |
Search for video ROM failure |
Run the VESA/VGA Interface tests in
the Dell Diagnostics. |
| 4-2-1 |
No time tick |
See "Getting Help"
for instructions on obtaining technical assistance. |
| 4-2-2 |
Shutdown failure |
See "Getting Help"
for instructions on obtaining technical assistance. |
| 4-2-3 |
Gate A20 failure |
See "Getting Help"
for instructions on obtaining technical assistance. |
| 4-2-4 |
Unexpected interrupt in protected mode |
See "Getting Help"
for instructions on obtaining technical assistance. |
| 4-3-1 |
Memory failure above address 0FFFFh |
Run the System Memory tests in the Dell Diagnostics. |
| 4-3-3 |
Timer-chip counter 2 failure |
See "Getting Help"
for instructions on obtaining technical assistance. |
| 4-3-4 |
Time-of-day clock stopped |
See "Getting Help"
for instructions on obtaining technical assistance. |
| 4-4-1 |
Serial or parallel port test failure |
Run the Serial Ports and the Parallel
Ports tests in the Dell Diagnostics. |
| 4-4-2 |
Failure to decompress code to shadowed memory |
Run the System Board Devices tests in
the Dell Diagnostics, if possible. |
| 4-4-3 |
Math-coprocessor test failure |
Run the System Board Devices tests in
the Dell Diagnostics, if possible. |
| 4-4-4 |
Cache test failure |
Run the System Board Devices tests in
the Dell Diagnostics, if possible. |
A warning message alerts you to a possible problem and asks you to
do something before execution continues. For example, before you format a diskette, a
message may warn you that you may lose all data on the diskette as a way to protect
against inadvertently erasing or writing over the data. These warning messages usually
interrupt the procedure and require you to respond by typing y (yes) or n
(no).
|
NOTE: Warning messages are generated by either
your application programs or your operating system. See "Software
Problems" and the documentation that accompanied your operating system and
application programs. |
When you run a test group or subtest in the Dell
Diagnostics, an error message may result. These particular error messages are not
covered in this section. Record the message on a copy of the Diagnostics Checklist found
in "Getting Help." Also see "Getting
Help" for instructions on obtaining technical assistance.
Should your system fail to operate, light-emitting diodes (LEDs) on
the front panel and back panel
of the chassis provide diagnostic codes that can help you troubleshoot a system problem.
The following sections describe the meaning of the diagnostic codes.
Front Panel LED
Table 3 lists the codes for the front panel diagnostic LED, gives
their probable causes, and offers suggested corrective actions.
Table 3. Power Switch Diagnostic LED Codes
| Power LED Code |
Cause |
Action |
| Blinking yellow |
The system power supply may have failed. |
See "Getting Help" for
instructions on obtaining technical assistance. |
| Solid yellow |
A device on the system board may be faulty or is
incorrectly installed. |
Be sure that each microprocessor is properly seated, remove all expansion cards, and then reboot. If the
system does not boot, see "Getting Help" for instructions
on obtaining technical assistance. |
| Solid green and a beep code during POST |
A problem was detected while the BIOS was executing. |
See Table 2
for instructions on diagnosing the beep code. |
| Solid green power indicator with no beep code and
no video during POST |
The monitor or the graphics card may be faulty. |
See "Video and Monitor Problems ."
If the monitor is operating properly and is correctly connected, see "Getting Help" for instructions on obtaining technical assistance. |
| Solid green power indicator and no beep code but
the system locks up during POST |
An integrated system board device may be faulty. |
See "Getting Help" for
instructions on obtaining technical assistance. |
When you turn on your system, it performs a power-on self-test
(POST), which is a series of self-diagnostic checks. A successful POST ends with a single
beep that signifies the start of normal operation. If the system fails to emit the single
beep or appears to stop responding during POST, a series of LEDs located at the rear of
the computer can help you understand which POST test failed or why the system stopped
responding. These LEDs indicate problems encountered during POST only, not during normal
operation.
The LED patterns described in Table 4 can help you determine what to
do to resolve the problem. If a problem resolution requires you to open the computer
chassis, refer to "Finding Solutions" for
procedures you need to complete prior to performing the suggested resolution. If the
problem persists after you perform the suggested problem resolution(s), contact
Dell Technical Assistance for further help.
Table 4 lists the codes for the back panel diagnostic LEDs, gives
their probable causes, and offers suggested corrective actions. The LED patterns are shown
as they appear on the back of the desktop chassis (vertical position).
Table 4. Back Panel Diagnostic LED Codes
| LED
pattern |
|
Problem
Description |
Suggested
Resolution |
 |
off
off
off
off |
Normal off condition or
possible pre-BIOS failure |
Verify that the system is
plugged into a working outlet and that you have pressed the power button. |
 |
green
yellow
yellow
yellow |
Possible BIOS failure; the
system is in the recovery mode |
Run the BIOS Recovery Utility,
wait for recovery completion, and restart the system to retest. |
 |
yellow
green
yellow
yellow |
Possible processor failure |
Reseat the processor(s) and
the terminator card (if present), and restart the system to retest. |
 |
green
green
yellow
yellow |
Possible memory failure |
Reseat all DIMMs and restart
the system to retest. |
 |
yellow
yellow
green
yellow |
Possible expansion card
failure |
Remove each expansion card
individually, and restart the system to retest. Reinstall the
expansion card(s) one at a time, and restart the system to retest.
Move each expansion card one at a time to another PCI slot, and
restart the system to retest. |
 |
green
yellow
green
yellow |
Possible video card failure or
bad on-board video |
If you have a video card,
reseat it and restart the system to retest. If you have video integrated, you must replace
the system board. |
 |
yellow
green
green
yellow |
Possible diskette or hard
drive failure |
Reseat all power and data
cables, and restart the system to retest. |
 |
green
green
green
yellow |
Possible USB failure |
Reseat all USB devices and
cables, and restart the system to retest. |
 |
yellow
green
green
green |
Other failure |
Contact Dell for technical
assistance. |
 |
green
green
green
green |
Normal operating condition
after POST |
None. |
This section provides general guidelines for analyzing software problems. For detailed
troubleshooting information on a particular program, see the documentation that
accompanied the software or consult the support service for the software.
If your system is behaving erratically, back up your files immediately, then see your
operating system documentation for information on backing up data files.
Basic Checks:
- Ensure that the application program is compatible with the operating system installed in
your computer and that your computer meets the minimum hardware requirements needed to run
the software.
- Ensure that you properly installed and configured the application program. Reinstall the
program if necessary.
- Consult the software documentation or contact the software manufacturer for detailed
troubleshooting information on a particular application program.
- Ensure that you have not made an error while entering data.
- Make sure that problems are not caused by a virus — Use a virus-scanning
application program to check the diskettes or CDs.
- Verify that the program’s device drivers do not conflict with certain application
programs.
- Confirm that a problem is software-related by running the System Board Devices tests in
the Dell Diagnostics. If all tests run successfully, the error condition may be related to
a software problem.
- Ensure that the use of terminate-and-stay-resident (TSR) programs has not resulted in a
memory conflict.
- Remove or confirm the possibility of a program conflict by rebooting your computer
system.
- Make sure that a hardware conflict does not exist between devices.
Operating System Compatibility
Make sure the computer's operating environment is set up to accommodate the application
programs you use. Whenever you change the operating environment parameters, you may also
affect the successful operation of the application programs. Sometimes, after modifying
the operating environment, you may need to reinstall a program that no longer runs
properly.
If a specific key or set of keys is pressed at the wrong time, a program may give you
unexpected results. See the documentation that came with your application program to make
sure the values or characters you are entering are valid.
Error messages can be produced by an application program, the operating system, or the
computer. "Messages and Codes" discusses the error messages
that are generated by the system. If you receive an error message that is not listed in
"Messages and Codes," check your operating system or application program
documentation.
Device Drivers
Programs that use specialized subroutines called device drivers can also cause
problems with your system. For example, a variation in the way the data is sent to the
monitor may require a special screen driver program that expects a certain kind of video
mode or monitor. In such cases, you may have to develop an alternative method of running
that particular program—the creation of a boot file made especially for that program,
for example. Call the support service for the software you are using to help you with this
problem.
Many utilities and supplementary programs load either when the computer boots or from
an operating system prompt. These programs are designed to stay resident in system memory
and thus always be available for use. Because they remain in the computer's memory, memory
conflicts and errors can result when other programs require use of all or part of the
memory already occupied by these TSR programs.
Typically, your operating system's start-up files (such as config.sys
and autoexec.bat) contain commands to start TSR programs when you boot
your system. If you suspect that one of these TSR programs is causing a memory conflict,
remove the commands that start them from the start-up files. If the problem you were
experiencing does not recur, one of the TSR programs probably created the conflict. Add
the TSR commands back into the start-up files one at a time until you identify which TSR
program is creating the conflict.
Some programs may leave portions of their setup information behind, even though you
have exited from them. As a result, other programs cannot run. Rebooting your system can
confirm whether or not these programs are the cause of the problem.
Memory address conflicts occur when two or more devices try to access the same address
in the upper memory blocks (UMB). For example, if a network expansion card and an
expanded-memory page frame are assigned an overlapping block of addresses, a memory
address conflict arises. As a result, when you try to log in to the network, the operation
fails.
To resolve this type of conflict, you can change the address of one of the devices. For
example, in the case of the network expansion card and expanded-memory page frame address
conflict, you can move the network card to an address block in the range of CC000h through
D0000h. To reassign the expansion card's address block, refer to the documentation for the
card.
Problems can arise if two devices attempt to use the same interrupt request (IRQ) line.
To avoid this type of conflict, check the documentation for the default IRQ-line setting
for each installed expansion card. Then consult the following table to configure the card
for one of the available IRQ lines.
|
NOTE: Table 1 lists default IRQ settings. In systems
with Plug and Play capabilities, you can modify the default settings. If you install a
Plug and Play card in a Plug and Play system, the system automatically selects an open IRQ
line if any are available. |
Table 5. Default IRQ Line
Assignments
| IRQ Line |
Used/Available |
| IRQ0 |
Used by the system timer |
| IRQ1 |
Used by the keyboard to signal that the
output buffer is full |
| IRQ2 |
Used by interrupt controller 1 to enable
IRQ8 through IRQ15 |
| IRQ3 |
Used by serial port 2 |
| IRQ4 |
Used by serial port 1 |
| IRQ5 |
Available |
| IRQ6 |
Used by the diskette controller |
| IRQ7 |
Used by the parallel port |
| IRQ8 |
Used by the real-time clock (RTC) |
| IRQ9 |
Used by the video graphics array (VGA)
interface (optional) |
| IRQ10 |
Available |
| IRQ11 |
Available |
| IRQ12 |
Used by the mouse port |
| IRQ13 |
Used by the math coprocessor (if
applicable) |
| IRQ14 |
Used by the primary integrated drive
electronics (IDE) controller |
| IRQ15 |
Used by the secondary IDE controller |
|
