IBM manual Diagnostic LEDs, IBM xSeries 220 User’s Reference

Error LED (on the	System board or	Cause	Action
system board or	front panel LED
front panel)	on
On	VRM 1 or VRM 2	One of the microprocessor VRMs has	1. Check the microprocessor VRM
	(system board)	failed, or a microprocessor VRM is	error LEDs on the system board.
		installed in the wrong connector.	If a microprocessor VRM error
			LED is on for a microprocessor
			VRM connector that has a
			terminator card installed instead
			of a microprocessor, the
			microprocessor VRMs are not
			installed in the correct order. See
			“Installing and removing a
			microprocessor” on page 54 for
			information about the correct
			order for installing
			microprocessor VRMs.
			Otherwise, continue with the
			next step.
			2. Turn off the server, reseat the
			microprocessor VRM indicated
			by the lit microprocessor VRM
			error LED, and restart the server.
			3. If the problem persists, replace
			the microprocessor VRM.
			If the problem persists, have the
			system serviced.
On	System error	The diagnostic LEDs have detected a	1. Check the error LEDs on the
	(front panel)	system error.	system board to locate the failing
			or incorrectly installed
			component.
			2. Follow the instructions in this
			table for replacing the failing
			component or removing and
			reinstalling the incorrectly
			installed component.
			If the problem persists, have the
			system serviced.
Off	None	The diagnostic LEDs have not	None
		detected a system error.

Table 15. Diagnostic LEDs

100 IBM® xSeries 220 User’s Reference