Dell DCSM specifications Diagnostic Lights, Light Pattern Problem Description Suggested Resolution

		identified.
		If the computer does not boot, contact Dell for technical
		assistance.
Blinking yellow	A power supply or system board failure has occurred.	Check the diagnostic lights to see if the specific problem is
		identified. Also, see "Power Problems."
Solid green and a beep code during	A problem was detected while the BIOS was executing.	See "Beep Codes" for instructions on diagnosing the beep
POST		code. Also, check the diagnostic lights to see if the specific
		problem is identified.
Solid green power light and no beep	The monitor or the graphics card may be faulty or	Check the diagnostic lights to see if the specific problem is
code and no video during POST	incorrectly installed.	identified. See "Video and Monitor Problems."
Solid green power light and no beep	An integrated system board device may be faulty.	Check the diagnostic lights to see if the specific problem is
code but the computer locks up		identified. If the problem is not identified, contact Dell for
during POST		technical assistance.

Diagnostic Lights

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

To help you troubleshoot a problem, your small form factor, small desktop, and small mini-tower computers have four lights labeled "A," "B," "C," and "D" on the back panel. The lights can be yellow or green. When the computer starts normally, the patterns or codes on the lights change as the boot process completes. If the POST portion of system boot completes successfully, all four lights display solid green. If the computer malfunctions during the POST process, the pattern displayed on the lights may help identify where in the process the computer halted.

NOTE: The orientation of the diagnostic lights may vary depending on the system type. The diagnostic lights can appear either vertical or horizontal.

Y = Yellow

G = Green

Light Pattern	Problem Description	Suggested Resolution
	The computer is in a normal off	Plug the computer into a working electrical outlet and press the power button.
	condition or a possible pre-BIOS
	failure has occurred.
	A possible BIOS failure has	Run the BIOS Recovery utility, wait for recovery completion, and then restart the computer.
	occurred; the computer is in the
	recovery mode.
	A possible processor failure has	Reinstall the processor and restart the computer.
	occurred.
	Memory modules are detected, but	• If you have one memory module installed, reinstall it and restart the computer. See "Memory"
	a memory failure has occurred.	for instructions on how to remove and install memory modules.
		• If you have two or more memory modules installed, remove the modules, reinstall one module,
		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 modules of the same type into your computer.
		• If the problem persists, contact Dell.
	A possible expansion card failure	• Determine if a conflict exists by removing a card (not the graphics card) and then restarting
	has occurred.	the computer.
		• If the problem persists, reinstall the card that you removed, remove a different card, and then
		restart the computer.
		• Repeat this process for each card. If the computer starts normally, troubleshoot the last card
		removed from the computer for resource conflicts.
		• Move each card one at a time to a different PCI slot and restart the computer after each move.
		• If the problem persists, contact Dell.
	A possible graphics card failure has	• If the computer has a graphics card, remove the card, reinstall it, and then restart the
	occurred.	computer.
		• If the problem still exists, install a graphics card that you know works and restart the
		computer.
		• If the problem persists or the computer has integrated graphics, contact Dell.
	A possible floppy or hard drive	Reseat all power and data cables and restart the computer.
	failure has occurred.
	A possible USB failure has	Reinstall all USB devices, check cable connections, and then restart the computer.
	occurred.