Dell DCCY, DCSM, 740 Diagnostic Lights, Light Pattern Problem Description Suggested Resolution

Blinking green	The computer is in a power-saving mode (Microsoft®	Press the power button, move the mouse, or press a key
	Windows® XP).	on the keyboard to wake the computer.
Blinks green several times and then	A configuration error exists.	Check the diagnostic lights to see if the specific problem is
turns off		identified.
Solid yellow	The Dell Diagnostics is running a test, or a device on the	If the Dell Diagnostics is running, allow the testing to
	system board may be faulty or incorrectly installed.	complete.
		If the computer does not boot, contact Dell for technical
		assistance.
Blinking yellow	A power supply or system board failure has occurred.	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 computer has four lights labeled "1," "2," "3," and "4" on the front panel. The lights can be off 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 LEDs 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.

Light Pattern	Problem Description	Suggested Resolution
	The computer is in a normal off condition,	Plug the computer into a working electrical outlet and press the power button.
	or a possible pre-BIOS failure has
	occurred.
	The diagnostic lights are not lit after the
	computer successfully boots to the
	operating system.
	A possible BIOS failure has occurred; the	Run the BIOS Recovery utility, wait for recovery completion, and then restart the computer.
	computer is in the recovery mode.
	A possible processor failure has occurred.	Reinstall the processor and restart the computer.
	Memory modules are detected, but a	• If you have one memory module installed, reinstall it and restart the computer (see
	memory failure has occurred.	Memory 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 of the same type into your computer.
		• 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 failure has	Reseat all power and data cables and restart the computer.
	occurred.
	A possible USB failure has occurred.	Reinstall all USB devices, check cable connections, and then restart the computer.
	No memory modules are detected.	• If you have one memory module installed, reinstall it and restart the computer (see
		Memory 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 of the same type into your computer.
		• If the problem persists, contact Dell.