Memory Problems - Lenovo System x3100 M4 Installation And Service Manual

Memory problems

Table 20. Memory problems and actions
• Follow the suggested actions in the order in which they are listed in the Action column until the problem is
solved.
• If an action step is preceded by "(Trained technician only)", that step must be performed only by a trained
technician.
• Go to the IBM support website at
tips, and new device drivers or to submit a request for information.
Symptom
The amount of system memory
that is displayed is less than
the amount of installed
physical memory.
Multiple DIMMs in a channel
are identified as failing.
System x3100 M4 Installation and Service Guide
118
http://www.lenovo.com/support
Action
Note: Each time you install or remove a DIMM, you must disconnect the server from
the power source; then, wait 10 seconds before restarting the server.
1. Make sure that:
• No error LEDs are lit on the operator information panel.
• The memory modules are seated correctly.
• You have installed the correct type of memory.
• 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
page 112).
4. Make sure that there is no memory mismatch when the server is over the
minimum memory configuration (one 1 GB DIMM) and that you have installed
the correct number of DIMMs.
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
Note: Each time you install or remove a DIMM, you must disconnect the server from
the power source; then, wait 10 seconds before restarting the server.
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 technician only) Replace the system board.
to check for technical information, hints,
"Running DSA Preboot diagnostic programs" on