Dell H7228 manual Diagnostic Lights, Light Pattern Problem Description Suggested Resolution

Advanced Troubleshooting

Diagnostic Lights

To help you troubleshoot a problem, your computer is equipped with four lights on the back panel labeled "A," "B," "C," and "D" (see page 57). These lights can be yellow or green. When the computer starts normally, the lights flash. After the computer starts, the lights remain 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 in the Product Information Guide.

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

= yellow

= green

= off

Advanced Troubleshooting

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