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 3, “Parts listing, System x3500 Type 7977,” on page 41 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.
Symptom Action
The amount of system memory
that is displayed is less than the
amount of installed physical
memory.
1. Make sure that:
v No error LEDs are lit on the operator information panel or on the DIMM.
v Memory mirroring does not account for the discrepancy.
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 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” on page 138).
4. Make sure that there is no memory mismatch when the server is at the
minimum memory configuration (two 512 MB DIMMs; see the information about
the minimum required configuration on page 161).
5. Add one pair of DIMMs at a time, making sure that the DIMMs in each pair are
matching.
6. Reseat the DIMMs.
7. Replace the components in step 6, one at a time, in the order shown, restarting
the server each time.
Multiple rows of DIMMs in a
branch are identified as failing.
1. Reseat the DIMMs; then, restart the server.
2. Replace the lowest-numbered pair of DIMMs with an identical known good pair
of DIMMs; then, restart the server. Repeat as necessary. If the failures continue
after all identified pairs are replaced, go to step4.
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 each DIMM in the
failed pair with an identical known good DIMM, restarting the server after you
reinstall each DIMM. Replace the failed DIMM. Repeat step 3 until you have
tested all removed DIMMs.
4. (Trained service technician only) Replace the system board.
122 IBM System x3500 Type 7977: Problem Determination and Service Guide
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