Dell MD504 manual Install one memory module in memory module, Connector DIMM1, Information

Light Pattern	Problem Description	Suggested Resolution
	A possible USB failure	Reinstall all USB devices, check cable connections,
	has occurred.	and then restart the computer.
	No memory modules	1	Reseat the memory modules to ensure that your computer
	are detected.		is successfully communicating with the 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 your User’s Guide for more
			information.
		7	If the memory module passes, shut down the 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.
	No memory modules	• If you have one memory module installed, reinstall it
	are detected.		and restart the computer.

•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.

System board failure	Contact Dell for technical assistance.
has occurred.

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