Dell DCDO, 710 H2C Diagnostic Lights, Light Pattern, Problem, Suggested Resolution, Description

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 lights labeled 1, 2, 3, and 4 on the front panel (see Front View). 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	Suggested Resolution
	Description

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.

A possible processor failure has occurred.

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

Plug the computer into a working electrical outlet (see "Power Problems" in your Owner's Manual).

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 Installing 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 working memory of the same type into your computer (see Installing Memory).

If the problem persists, contact Dell (see "Contacting Dell" in your Owner's Manual).

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.

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 Installing 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 working memory of the same type into your computer (see Installing Memory).

If the problem persists, contact Dell (see "Contacting Dell" in your Owner's Manual).