Lenovo ThinkServer TD200x User Manual download pdf (Page 147)

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 Hardware Maintenance Manual to determine which components are customer

replaceable units (CRUs) and which components are field replaceable units (FRUs).

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 or on the DIMM.

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

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 for DIMM error messages:

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 "Diagnostic programs, messages, and error

codes" in the Hardware Maintenance Manual).

4. Make sure that there is no memory mismatch when the server is at the

minimum memory configuration (two 512 MB DIMMs; see the information about

the minimum required configuration on page “Solving undetermined problems”

on page 140).

5. Add one pair of DIMMs at a time, making sure that the DIMMs in each pair are

matching.

6. Reseat the DIMMs.

7. Replace the DIMMs in step 6, one at a time, in the order shown, restarting the

server each time.

Multiple rows of DIMMs in a

branch are identified as failing.

1. Reseat the DIMMs; then, restart the server.

2. Replace the lowest-numbered DIMMs with identical known good DIMMs; then,

restart the server. Repeat as necessary. If the failures continue after all

identified pairs are replaced, go to step4.

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 you

reinstall each DIMM. Replace the failed DIMM. Repeat step 3 until you have

tested all removed DIMMs.

4. (Trained service technician only) Replace the system board.

Chapter 7. Troubleshooting 131

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Lenovo ThinkServer TD200x User Manual Page 147

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