Dell T8144 manual Diagnostic Lights

Troubleshooting Tools

Diagnostic Lights

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

Product Information Guide.

To help you troubleshoot a problem, your computer has four lights labeled "1," "2," "3," and "4" on the front panel (see page 57). 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.

Light Pattern	Problem Description	Suggested Resolution
	The computer is in a normal "off"	Plug the computer into a working electrical outlet
	condition or a possible pre-BIOS	and press the power button. Also see "Power
	failure has occurred.	Problems" on page 36.
	The diagnostic lights are not lit
	after the computer successfully
	boots to the operating system.
	A possible processor failure	Contact Dell (see page 116).
	has occurred.
	Memory modules are detected,	• If you have two or more memory modules
	but a memory failure	installed, remove the modules, reinstall one
	has occurred.	module (see page 64), and then restart the
		computer. If the computer starts normally,
		reinstall an additional module. Continue until
		you have identified a faulty module or reinstalled
		all modules without error.
		• If available, install properly working memory of
		the same type into your computer (see page 64).
		• If the problem persists, contact Dell
		(see page 116).

Troubleshooting Tools

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