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 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).
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 or memory sparing does not account for the discrepancy.
v The memory modules are seated correctly.
v You have installed the correct type of memory (see “Installing a memory
module” on page 12).
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” in the
Problem Determination and Service Guide).
4. Make sure that there is no memory mismatch when the server is at the
minimum memory configuration (two 512 MB DIMMs).
5. Add one pair of DIMMs at a time, making sure that the DIMMs in each pair are
matching. Install the DIMMs in the sequence that is described in “Installing a
memory module” on page 12.
6. Reseat the DIMMs.
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) System board
Multiple rows of DIMMs in a
branch are identified as failing.
1. Reseat the DIMMs; then, restart the server.
2. Replace the lowest-numbered DIMM pair of those that are identified; then,
restart the server. Repeat as necessary.
3. (Trained service technician only) Replace the system board.
66 IBM System x3650 Type 7979: Installation Guide
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