Lenovo ThinkServer RD120 User Manual download pdf (Page 69)

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 (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 10).

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

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).

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 10.

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.

Chapter 5. Solving problems 55

Lenovo ThinkServer RD120 User Manual Page 69

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Lenovo ThinkServer RD120 User Manual Page 69

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