Diagnostic Lights - Dell Dimension E520 Service Manual

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
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.
.
Light Pattern Problem Description
The computer is in a
normal "off" condition or
a possible pre-BIOS
failure has occurred.
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.
A possible graphics card
failure has occurred.
A possible floppy drive or
hard drive failure has
occurred.
A possible USB failure
has occurred.
No memory modules are
detected.
Memory modules are
detected, but a memory
configuration or
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Suggested Resolution
Plug the computer into a working electrical outlet (see
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
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
If the problem persists, contact Dell (see "Contacting Dell" in your
Owner's Manual).
Reseat any installed graphics cards (see Cards).
If available, install a working graphics card into your computer.
If the problem persists, contact Dell (see "Contacting Dell" in your
Owner's Manual).
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
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
If the problem persists, contact Dell (see "Contacting Dell" in your
Owner's Manual).
Ensure that no special requirements for memory module/connector
placement exist (see Memory).
Ensure that the memory you are using is supported by your computer
Installing Memory).
Installing Memory).
Front View of
Power Lights).
Installing
Installing