Memory Problems; Microprocessor Problems - IBM System x3400 Type 7975 Installation 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 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
The amount of system memory
that is displayed is less than the
amount of installed physical
memory.

Microprocessor 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
A microprocessor LED is lit
during POST, indicating that the
startup (boot) microprocessor is
not working correctly.
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System x3400 Types 7973, 7974, 7975, and 7976: Installation Guide
Action
1. Make sure that:
v No error LEDs are lit on the control-panel assembly or on the system board.
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 All DIMMs are enabled. The server might have automatically disabled a
DIMM when it detected a problem.
2. Check the POST error log for error message 289.
If a DIMM was disabled by a system-management interrupt (SMI), replace the
DIMM.
3. Run memory diagnostics (see "Running the diagnostic programs" in the
Problem Determination and Service Guide on the IBM System x3400
Documentation CD).
4. Make sure that there is no memory mismatch when the server is over the
minimum memory configuration (one 512 MB DIMM) and that you have
installed the correct number of DIMMs (see the User's Guide on the IBM
System x3400 Documentation CD for information about installing memory
modules).
5. Reseat the DIMMs.
6. 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
Action
1. Make sure that the server supports the microprocessor.
2. (Trained service technician only) Reseat the microprocessor.
3. Replace the following components one at a time, in the order shown, restarting
the server each time:
a. (Trained service technician only) Microprocessor
b. (Trained service technician only) System board