Memory Problems - IBM x3250 M3 Problem Determination And Service Manual

Memory problems

v Follow the suggested actions in the order in which they are listed in the Action column until the problem
is solved.
v See Chapter 4, "Parts listing, System x3250 M3 Types 4251, 4252, and 4261," on page 119 to determine
which components are customer replaceable units (CRU) and which components are field replaceable
units (FRU).
v If an action step is preceded by "(Trained service technician only)," that step must be performed only by a
Trained service technician.
v Go to the IBM support website at http://www.ibm.com/systems/support/ to check for technical information,
hints, tips, and new device drivers or to submit a request for information.
Symptom
The amount of system memory
that is displayed is less than the
amount of installed physical
memory.
Multiple rows of DIMMs in a
branch are identified as failing.
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IBM System x3250 M3 Types 4251, 4252, and 4261: Problem Determination and Service Guide
Action
1. Make sure that:
v No error LEDs are lit on the operator information panel.
v The memory modules are seated correctly.
v You have installed the correct type of memory.
v All banks of memory are enabled. The server might have automatically
disabled a memory bank when it detected a problem.
2. Check the POST error log:
v If a DIMM was disabled by a systems-management interrupt (SMI), replace
the DIMM.
3. Run memory diagnostics (see "Running the diagnostic programs" on page 78).
4. Make sure that there is no memory mismatch when the server is at the
minimum memory configuration.
5. Add one pair of DIMMs at a time, making sure that the DIMMs in each pair
match.
6. Reseat the DIMM.
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) Replace the system board
1. Reseat the DIMMs; then, restart the server.
2. Replace the failing DIMM.
3. (Trained service technician only) Replace the system board.