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 5, “Parts listing,” on page 153 to check if a component is a consumable, structural, or FRU part.
v If an action step is preceded by “(Trained technician only),” that step must be performed only by a trained
technician.
Symptom Action
The amount of system memory
that is displayed is less than the
amount of installed physical
memory.
Note: If you change memory, you must update the memory configuration in the
Setup utility.
1. Make sure that:
v No error LEDs are lit on the operator information panel, on the memory
tray, or on the MAX5 memory expansion module.
v Memory mirroring does not account for the discrepancy.
v The memory modules are seated correctly (see “Removing a memory
module” on page 186 and “Replacing a memory module” on page 187).
v You have installed the correct type of memory.
v If you changed the memory, you updated the memory configuration in the
Setup utility.
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 event log:
v If a DIMM was disabled by a systems-management interrupt (SMI), replace
the DIMM.
v If a DIMM was disabled by the user or by POST, run the Setup utility and
enable the DIMM.
3. Run memory diagnostics (see “Running the DSA Preboot diagnostic programs”
on page 129).
4. Make sure that there is no memory mismatch when the server is at the
minimum memory configuration ( see “Memory module installation” on page
60 for information about DIMM rules and population sequence).
5. Reseat the DIMM.
6. Restart the server.
Multiple rows of DIMMs in a
branch are identified as failing.
1. Reseat the DIMMs; then, restart the server.
1. 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 failures continue after all identified pairs are
replaced, go to step 4.
2. 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
each DIMM. Replace the failed DIMM. Repeat step 3 until you have tested all
removed DIMMs.
3. Replace the lowest-numbered DIMM pair of those identified; then, restart the
server. Repeat as necessary.
4. (Trained technician only) Replace the system board.
Chapter 4. Troubleshooting 137
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