Dell 390 manual That your computer is successfully

Light Pattern Problem Description Suggested Resolution

A possible BIOS failure has occurred; the computer is in the recovery mode.

Run the BIOS Recovery utility, wait for recovery completion, and then restart the computer.

A possible processor failure	Reinstall the processor and restart
has occurred.	the computer.
Memory modules are detected,	1 Reseat the memory modules to ensure
but a memory failure has occurred.		that your computer 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 4.
	4	Restart the computer.
		The following message appears:
		Alert! Operating in Debug
		Mode. Please Populate
		Memory in Pairs for Normal
		Operation.
	5	Press <F1> to boot to the operating
		system.
	6	Run the Dell Diagnostics. See page 34
		for instructions.
	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. For instructions on contacting Dell, see your User’s Guide.

NOTE: If necessary, the computer can operate in debug mode until new memory modules are installed.

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