Dell 690 manual Diagnostic Light Codes During Post

	amber	A possible failure has been detected in a	Verify that any required power cables are connected to the memory and graphics
		plug-in component such as a graphics riser	riser cards.
		card or memory riser card.
(blinking)			Perform the procedure in Power Problems.
	amber	A possible power supply failure has	Verify that both power supply cables are plugged in to the motherboard.
		occurred.
(blinking)

Diagnostic Light Codes During POST

The power light displays a solid green for diagnostic light codes during POST.

Light Pattern	Problem Description	Suggested Resolution
	A possible processor failure has occurred.	Reinstall the processor and restart the computer (see Processor).
	A possible expansion card failure has	1.	Determine if a conflict exists by removing a card (not the graphics card) and then
	occurred.		restarting the computer. See Cards.
		2.	If the problem persists, reinstall the card that you removed, remove a different card,
			and then restart the computer.
		3.	Repeat this process for each card. If the computer starts normally, troubleshoot the last
			card removed from the computer for resource conflicts (see Software and Hardware
			Incompatibilities).
		4.	If the problem persists, contact Dell (see Contacting Dell).
	A possible graphics card failure has	1.	If the computer has a graphics card, remove the card, reinstall it, and then restart the
	occurred.		computer. See Cards.
		2.	If the problem still exists, install a graphics card that you know works and restart the
			computer.
		3.	If the problem persists or the computer has integrated graphics, contact Dell (see
			Contacting 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.	1.	Reseat the memory modules to ensure that your computer is successfully
			communicating with the memory (see Memory).
		2.	Restart the computer.
		3.	If the problem still exists, remove all the memory modules and install one memory
			module in memory module connector DIMM_1.
		4.	Restart the computer.
			A message appears stating that because your memory is not paired, the system will
			operate with reduced performance and reduced error-correction capability
		5.	Press <F1> to boot to the operating system.
		6.	Run the Dell Diagnostics. See Dell Diagnostics.
		7.	If the memory module passes, shut down the computer (see Turning Off Your
			Computer), remove the memory module, and then repeat the process with the remaining
			memory modules until a memory error occurs during start-up or diagnostic testing.
			If the first memory module tested is defective, repeat the process with the remaining
			modules to ensure that the remaining modules are not defective.
		8.	When the defective memory module is identified, contact Dell for a replacement (see
			Contacting Dell).
	No memory modules are detected.	•	If you have one memory module installed, reinstall it and restart the computer see
			Memory).
		• If you have two or more memory modules installed, remove the modules, reinstall one
			module, and then restart the computer (see Memory). 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
			Memory).
		• If the problem persists, contact Dell (see Contacting Dell).
	System board failure has occurred.	Contact Dell for technical assistance (see Contacting Dell).
	Memory modules are detected, but a	•	Ensure that no special memory module/memory connector placement requirements exist
	memory configuration or compatibility		(see Memory).
	error exists.	•	Verify that the memory modules that you are installing are compatible with your
			computer (see Memory).
		• Reinstall the memory modules and restart the computer (see Memory).