IBM 79856au Installation Guide - Page 79
Memory, problems
UPC - 883436004374
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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 1. Make sure that: that is displayed is less than the amount of installed physical v No error LEDs are lit on the operator information panel. memory. v The memory modules are seated correctly. v You have installed the correct type of memory (see "Installing a memory module" on page 14). 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. 6. Reseat 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 7. Replace the components listed in step 7 one at a time, in the order shown, restarting the server each time. Chapter 5. Solving problems 65