Lenovo TD100X manual Memory problems

Memory problems

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

vSee Chapter 3, “Parts listing, TD100 Types 6398, 6399, 6419, 6429, 4203, and 4206,” on page 25 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 control-panel assembly or on the system board.
amount of installed physical
		v Memory mirroring does not account for the discrepancy.
memory.
		v The memory modules are seated correctly.
		v You have installed the correct type of memory.
		v All DIMMs are enabled. The server might have automatically disabled a
		DIMM when it detected a problem.
	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.
	3.	Run memory diagnostics (see “Running the diagnostic programs” on page 189).
	4.	Make sure that there is no memory mismatch when the server is over the
		minimum memory configuration (one 512 MB DIMM) and that you have
		installed the correct number of DIMMs (see the User’s Guide on the IBM
		System x3400 Documentation CD for information about installing memory
		modules).
	5.	Reseat the DIMMs.
	6.	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.	Remove the lowest-numbered DIMM pair of those that are identified and
		replace it with an identical pair of known good DIMMs; then, restart the server.
		Repeat as necessary. If the failure continues after all identified pairs are
		replaced, go to step 4
	3.	Return the removed DIMMs, one pair at a time, to their original connectors,
		restarting the server after each pair, until a pair fails. Replace the failed DIMM
		and restart the server. Repeat this step until you have tested all removed
		DIMMs.
	4.	(Trained service technician only) Replace the system board.

Chapter 5. Diagnostics 177