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Diagnostic Light Codes During POST
The following table lists the codes for the diagnostic lights that occur while
the computer is performing the POST.
NOTE: If the computer is turned on and all four diagnostic lights are not on,
see "Diagnostic Light Codes Before POST" on page 33.
D i a g n o s t i c L i g h t C o d e s D u r i n g P O S T
Light Pattern
Cause
Possible BIOS failure, and the computer is in
the recovery mode.
A B C D
Possible microprocessor failure.
A B C D
Possible memory failure.
A B C D
Possible expansion card failure or conflict.
A B C D
Possible video card failure.
A B C D
Possible diskette drive or hard-drive failure.
A B C D
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= g r e e n
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All manuals and user guides at all-guides.com
Action
Run the BIOS Recovery utility, and restart the
computer to retest. See "BIOS Recovery Utility"
in the User's Guide.
If the problem is still not resolved, see "Reset
Corrupted BIOS Settings" in the User's Guide.
See "Microprocessor Problems" in the
User's Guide.
See "System Memory Problems" in the
User's Guide.
See "Expansion-Card Problems" and "Hardware
Conflicts" in the User's Guide.
Reseat the video card, and restart the computer
to retest. For instructions on removing and
installing an expansion card, see "Removing an
Expansion Card" in the User's Guide.
If the problem is not resolved, see "Expansion-
Card Problems" in the User's Guide.
If the problem is still not resolved, contact Dell
for technical assistance.
See "Diskette Drive Problems" and "Hard Drive
Problems" in the User's Guide.
Setup and Quick Reference Guide
35
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