IBM 8688 Check Dimm error LED on memory board, Run the AMIDiag program, Check individual fan LEDs

Level 2 Light Path LED	FRU/action
MEM LED on (memory error)	1.	Check DIMM error LED on memory board.
		Note: If there is a DIMM failure, an LED on the memory board indicates the
		failing DIMM. Reseat the failing DIMMs, re-enable the DIMMs using the
		Configuration/Setup Utility program, and run AMIDiag to pinpoint the failing
		DIMM.
	2.	DIMM.
	3.	Memory board.
DASD LED on (hot-swap hard	1.	Run the AMIDiag program.
drive failure)
	2.	Failing drive (reseat/replace).
Note: If RAID system, refer to the
	3.	Be sure the fans are operating correctly and the air flow is good.
Hardware Maintenance Manual for
the specific RAID adapter.	4.	SCSI backplane.
PCI-X BUS LED on (adapter	1.	Check the system-error log.
failure)
	2.	If there is a PCI-X slot available, move the adapter to an empty PCI-X slot,
		and restart the server.
	3.	Failing adapter.
	4.	PCI-X board.
FAN LED on (fan failure)	1.	Check individual fan LEDs.
Note: A failing fan can also cause
	2.	Replace respective fan.
the TEMP and DASD LEDs to be
	3.	Front fan connectors.
on.
	4.	I/O board.
TEMP LED on (temperature too	1.	If a fan LED is on, replace the fan.
high)
	2.	Ambient temperature must be within normal operating specifications. See
		“Features and specifications” on page 3.
	3.	Examine the system-error log.
		a. System over recommended temperature
		b. Operator information panel
		c. DASD over recommended temperature — overheating hard disk drive.
		d. System over temperature for processor x (where x is processor number)
		— microprocessor x.
		e. VRM LED on — failing VRM.
		f. Power supply fault / over temp — failing power supply
NMI (nonmaskable interrupt)	1.	See the system-error log.
Note: A PCI or MEM LED may
	2.	If a PCI LED is on, follow the instructions for that LED.
also be on.
	3.	If a MEM LED is on, follow the instructions for that LED.
	4.	Restart the server.
Board LED on (system monitor	1.	Turn off the server and disconnect the ac power cord.
detected an error on one of the six
	2.	Wait at least 10 seconds before plugging in the ac power cord again, and
system boards (see system board
		restart the server.
LEDs 1-6 for additional location
	3.	Failed system board.
information)
Event Log	See the system-error log.
PS1 LED on	1.	Power supply 1
	2.	Top power board
	3.	Midplane board
PS2 LED on	1.	Power supply 2
	2.	Top power board
	3.	Midplane board

148IBM xSeries 450 Type 8688: Hardware Maintenance Manual and Troubleshooting Guide