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Advanced Troubleshooting

Dell™Dimension™8300SeriesServiceManual

Diagnostic Lights

Beep Codes

System Messages

Diagnostic Lights

To help you troubleshoot a problem, your computer is equipped with four lights on the back panel labeled "A," "B," "C," and "D." These lights can be yellow or

green. When the computer starts normally, the lights flash. After the computer starts, all four lights will display solid green. If the computer malfunctions, the

color and sequence of the lights identify the problem.



CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in your Owner's Manual.

Light Pattern

Problem Description

Suggested Resolution



The computer is in a normal

off condition or a possible

pre-BIOS failure has

occurred.

Verify that the computer is plugged into a working electrical outlet and that you have pressed the power

button.



Memory modules are

detected, but a memory

failure has occurred.

l If you have one memory module installed, reinstall the module and restart the computer.

l If you have two or more memory modules installed, remove the modules, reinstall one module,

and then restart the computer. If the computer starts normally, reinstall an additional module.

Continue until you have identified a faulty module or reinstalled all modules without error.

l If available, install properly working memory of the same type into your computer.

l If the problem persists, contact Dell. See "Contacting Dell" in your Owner's Manual for technical

assistance.



A possible expansion card

failure has occurred.

1. Determine if a conflict exists by removing a card (not the video card) and then restarting the

computer.

2. If the problem persists, reinstall the card that you removed, remove a different card, and then

restart the computer.

3. Repeat this process for each card. If the computer starts normally, troubleshoot the last card

removed from the computer for resource conflicts (see "Resolving Software and Hardware

Incompatibilities" in your Owner's Manual).

4. If the problem persists, contact Dell. See "Contacting Dell" in your Owner's Manual for technical

assistance.



A possible video card failure

has occurred.

l If the computer has a video card, remove the card and reinstall it, and restart the computer.

l If the problem still exists, install a video card that you know works and restart the computer.

l If the problem persists or the computer has integrated video, contact Dell. See "Contacting Dell" in

your Owner's Manual for technical assistance.



A possible floppy or hard

drive failure has occurred.

Reseat all power and data cables and restart the computer.



A possible USB failure has

occurred.

Reinstall all USB devices, check cable connections, and then restart the computer.



No memory modules are

detected.

l Reinstall all memory modules and restart the computer.

l To eliminate the possibility of a faulty memory connector, remove all memory modules, reinstall one

memory module (if the computer supports a single module), and then restart the computer. If the

computer starts normally, move the memory module to a different connector and restart the

computer. Continue until you have identified a faulty connector or reinstalled all modules without

error.



Memory modules are

detected, but a memory

configuration or compatibility

error exists.

l Ensure that there are no special memory module/memory connector placement requirements.

l Verify that the memory modules that you are installing are compatible with your computer.

l If the problem persists, contact Dell. See "Contacting Dell" in your Owner's Manual for technical

assistance.



Other failure has occurred.

l Ensure that the cables are properly connected from the hard drive, CD drive, and DVD drive to the

system board.

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