IBM 8485, 8490 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 the parts listing in the Problem Determination and Service Guide 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 front-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 If you changed the memory, you updated the memory configuration in the
		Configuration/Setup Utility program.
		v All DIMMs are enabled. The server might have automatically disabled a
		DIMM when it detected a problem, or a DIMM 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
		Problem Determination and Service Guide on the IBM xSeries Documentation
		CD).
	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
		xSeries Documentation CD for information about installing optional 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

68xSeries 206m Types 8485 and 8490: Installation Guide