Dell 533CX manual A B C D, = y e l l o w = g r e e n = o f f

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 Action

Possible BIOS failure, and the computer is in the recovery mode.

Run the BIOS Recovery utility, and restart the computer to retest. See "BIOS Recovery Utility" in the User’s Guide.

A B C D	If the problem is still not resolved, see "Reset
	Corrupted BIOS Settings" in the User’s Guide.
Possible microprocessor failure.	See "Microprocessor Problems" in the
	User’s Guide.
A B C D
Possible memory failure.	See "System Memory Problems" in the
	User’s Guide.
A B C D
Possible expansion card failure or conflict.	See "Expansion-Card Problems" and "Hardware
	Conflicts" in the User’s Guide.
A B C D
Possible video card failure.	Reseat the video card, and restart the computer
	to retest. For instructions on removing and
A B C D	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.
Possible diskette drive or hard-drive failure.	See "Diskette Drive Problems" and "Hard Drive
	Problems" in the User’s Guide.
A B C D

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Setup and Quick Reference Guide

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