Lenovo 3797 manual Memory problems, Hardware Maintenance Manual

Memory problems

vFollow the suggested actions in the order in which they are listed in the Action column until the problem is solved.

vSee the parts listing in the Hardware Maintenance Manual to determine which components are customer replaceable units (CRU) and which components are field replaceable units (FRU).

vIf an action step is preceded by “(Trained service technician only),” that step must be performed only by a trained service technician.

Symptom	Action
The amount of system memory	1.	Make sure that:
that is displayed is less than the
		v No error LEDs are lit on the operator information panel.
amount of installed physical
		v Memory mirroring or memory sparing does not account for the discrepancy.
memory.
		v The memory modules are seated correctly.
		v You have installed the correct type of memory . See the User Guide on the
		Lenovo ThinkServer Documentation DVD, which comes with the server.
		v If you changed the memory, you updated the memory configuration in the
		Configuration/Setup Utility program.
		v All banks of memory are enabled. The server might have automatically
		disabled a memory bank when it detected a problem, or a memory bank
		might have been manually disabled.
	2.	Check the POST error log for error message 289:
		v If a DIMM was disabled by a system-management interrupt (SMI), replace
		the DIMM.
		v If a DIMM was disabled by the user or by POST, run the Configuration/Setup
		Utility program and enable the DIMM.
	3.	Run memory diagnostics (see “Running the diagnostic programs” in the
		Hardware Maintenance Manual).
	4.	Make sure that there is no memory mismatch when the server is at the
		minimum memory configuration (two 512 MB DIMMs).
	5.	Add one pair of DIMMs at a time, making sure that the DIMMs in each pair are
		matching. Install the DIMMs in the sequence that is described in the User
		Guide on the Lenovo ThinkServer Documentation DVD, which comes with the
		server.
	6.	Reseat the DIMMs.
	7.	Replace the following components one at a time, in the order shown, restarting
		the server each time:
		a. DIMMs
		b. (Trained service technician only) System board
Multiple rows of DIMMs in a	1.	Reseat the DIMMs; then, restart the server.
branch are identified as failing.
	2.	Replace the lowest-numbered DIMM pair of those that are identified; then,
		restart the server. Repeat as necessary.
	3.	(Trained service technician only) Replace the system board.

134ThinkServer RD220 Types 3729, 3779, 3797, and 3798: Installation and User Guide