Dell XPS 420 Diagnostic Lights, Light Pattern Problem Description, Reseat the processor see

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•If the power light is steady amber, a device may be malfunctioning or incorrectly installed.

–Remove and then reinstall the memory modules (see "Memory" on page 104).

–Remove and then reinstall any cards (see "Cards" on page 109).

•Eliminate interference. Some possible causes of interference are:

–Power, keyboard, and mouse extension cables

–Too many devices on a power strip

–Multiple power strips connected to the same electrical outlet

Diagnostic Lights

CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide.

To help troubleshoot a problem, your computer has four blue lights labeled 1, 2, 3, and 4 on the top bezel (see "Front View" on page 15). When the computer starts normally, the lights flash before turning off. If the computer malfunctions, the sequence of the lights help to identify the problem.

NOTE: After the computer completes POST, all four lights turn off before booting to the operating system.

Light Pattern Problem Description Suggested Resolution

The computer is in a normal off condition or a possible pre-BIOS failure has occurred.

The diagnostic lights are not lit after the system successfully boots to the operating system.

•Plug the computer into a working electrical outlet (see "Power Problems" on page 69).

•If the problem persists, contact Dell (see "Contacting Dell" on page 200).

A possible processor failure	• Reseat the processor (see
has occurred.	"Processor" on page 154).
	• If the problem persists, contact
	Dell (see "Contacting Dell" on
	page 200).

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Troubleshooting