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

Advanced Troubleshooting

Dell™Dimension™4600C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 the Owner's Manual or Product Information

Guide.

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, reinstall it, and then 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 CD/DVD 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,

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