Dell XPS manual Advanced Troubleshooting, Diagnostic Lights

Advanced Troubleshooting

Diagnostic Lights

To help you troubleshoot a problem, your computer has four lights labeled "A," "B," "C," and "D" (see page 65) on the back panel. The lights can be yellow or green. When the computer starts normally, the lights flash. After the computer starts, all four lights 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 on page 9.

Light Pattern		Problem Description	Suggested Resolution
		The computer is in a normal off condition	Verify that the computer is plugged into a
		or a possible pre-BIOS failure has	working electrical outlet and that you
A B C	D	occurred.	have pressed the power button.
		A possible processor failure has occurred.	Reinstall the processor (see page 93) and
			restart the computer.

A B C D

Memory modules are detected, but a memory failure has occurred.

A B C D

1 Reinstall all memory modules (see page 73).

2 Ensure that all the connector tabs are locked.

3 Restart the computer.

4 If the problem persists, contact Dell (see page 112).

=yellow

=green

=off

Advanced Troubleshooting

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