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 the Hardware Maintenance Manual 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.
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
UEFI 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 systems-management interrupt (SMI), replace
the DIMM.
v If a DIMM was disabled by the user or by POST, run the UEFI Setup Utility
program and enable the DIMM.
3.
Run memory diagnostics (see “POST” on page 142).
4. Make sure that there is no memory mismatch when the server is at the
minimum memory configuration (two 1 GB DIMMs).
5. Add one pair of DIMMs at a time, making sure that the DIMMs in each pair
match.
6. Reseat the DIMM.
7. Restart the server.
Multiple rows of DIMMs in a
branch are identified as failing.
1. Reseat the DIMMs; then, restart the server.
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 failures continue 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 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.
4. Replace the lowest-numbered DIMM pair of those identified; then, restart the
server. Repeat as necessary.
5. (Trained service technician only) Replace the system board.
Chapter 7. Solving problems 149
