Advanced Troubleshooting: Dell Dimension E520 Service Manual
Diagnostic Lights
CAUTION: Before you perform any of the procedures in this section, follow the safety instructions in the Product Information Guide.
To help you troubleshoot a problem, your computer has four lights labeled 1, 2, 3, and 4 on the front panel (see Front View of the Computer). When the computer starts normally, the lights flash before turning off. If the computer malfunctions, the sequence of the lights helps to identify the problem.
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Light Pattern | Problem Description | Suggested Resolution |
The computer is in a normal "off" condition or
apossible
All four diagnostic lights display solid green and then turn off after the system successfully boots to the operating system.
A possible processor failure has occurred.
Memory modules are detected, but a memory failure has occurred.
Plug the computer into a working electrical outlet (see Power Lights). 
If the problem persists, contact Dell (see "Contacting Dell" in your Owner's Manual).
Reseat the processor (see Processor).
If the problem persists, contact Dell (see "Contacting Dell" in your Owner's Manual).
If two or more memory modules are installed, remove the modules (see Removing Memory), then reinstall one module (see Installing Memory) and restart the computer. If the computer starts normally, continue to install additional memory modules (one at a time) until you have identified a faulty module or reinstalled all modules without error.
If available, install properly working memory of the same type into your computer (see Installing Memory).
If the problem persists, contact Dell (see "Contacting Dell" in your Owner's Manual).
A possible graphics card | Reseat any installed graphics cards (see Cards). |
failure has occurred. | If available, install a working graphics card into your computer. |
| If the problem persists, contact Dell (see "Contacting Dell" in your |
| Owner's Manual). |
A possible floppy drive or hard drive failure has occurred.
A possible USB failure has occurred.
No memory modules are detected.
Reseat all power and data cables.
Reinstall all USB devices and check all cable connections.
If two or more memory modules are installed, remove the modules (see Removing Memory), then reinstall one module (see Installing Memory) and restart the computer. If the computer starts normally, continue to install additional memory modules (one at a time) until you have identified a faulty module or reinstalled all modules without error.
If available, install properly working memory of the same type into your computer (see Installing Memory).
If the problem persists, contact Dell (see "Contacting Dell" in your Owner's Manual).
Memory modules are | Ensure that no special requirements for memory module/connector |
detected, but a memory | placement exist (see Memory). |
configuration or | Ensure that the memory you are using is supported by your computer |
file:///T/htdocs/systems/dimE520/en/SM_EN/adtshoot.htm[10/16/2012 1:04:50 PM]