IBM x3655 - System - 7985 Installation Manual

Also see for System x3655 Type 7985: User guide Service guide

Contents

Memory problemsv Follow the suggested actions in the order in which they are listed in the Action column until the problemis solved.v See the parts listing in the Problem Determination and Service Guide to determine which components arecustomer 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 atrained service technician.Symptom ActionThe amount of system memorythat is displayed is less than theamount of installed physicalmemory.1. Make sure that:v No error LEDs are lit on the operator information panel.v The memory modules are seated correctly.v You have installed the correct type of memory (see “Installing a memorymodule” on page 14).v If you changed the memory, you updated the memory configuration in theConfiguration/Setup Utility program.v All banks of memory are enabled. The server might have automaticallydisabled a memory bank when it detected a problem, or a memory bankmight 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), replacethe DIMM.v If a DIMM was disabled by the user or by POST, run the Configuration/SetupUtility program and enable the DIMM.3. Run memory diagnostics (see “Running the diagnostic programs” in theProblem Determination and Service Guide).4. Make sure that there is no memory mismatch when the server is at theminimum memory configuration (two 512 MB DIMMs).5. Add one pair of DIMMs at a time, making sure that the DIMMs in each pair arematching.6. Reseat the following components one at a time, in the order shown, restartingthe server each time:a. DIMMsb. (Trained service technician only) System board7. 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