Memory Problems - Lenovo System x3550 M5 Installation And Service Manual

Table 12. Keyboard, mouse, or USB-device's symptoms and actions (continued)
• 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 Support Web site at http://www.lenovo.com/support to check for technical information, hints,
tips, and new device drivers or to submit a request for information.
Symptom

Memory problems

Use this information to solve memory problems.
Table 13. 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 Support Web site at http://www.lenovo.com/support to check for technical information, hints,
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.
Action
• The mouse option is enabled in the Setup Utility.
2. If you are using a USB mouse or USB device and it is connected to a USB
hub, disconnect the mouse or USB device from the hub and connect it directly
to the server.
3. Replace the mouse or USB-device.
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.
• No DIMM error LEDs are lit on the system board.
• Memory mirrored channel does not account for the discrepancy.
• The memory modules are seated correctly.
• You have installed the correct type of memory.
• If you changed the memory, you updated the memory configuration in the
Setup Utility.
• 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.
• There is no memory mismatch when the server is at the minimum memory
configuration.
2. Reseat the DIMMs, and then restart the server.
3. Check the POST error log:
• If a DIMM was disabled by a systems-management interrupt (SMI), replace
the DIMM.
• If a DIMM was disabled by the user or by POST, reseat the DIMM; then, run
the Setup Utility and enable the DIMM.
4. Check that all DIMMs are initialized in the Setup Utility; then, run memory
diagnostics (see "Running the DSA Preboot diagnostic programs" on page 68).
.
Chapter 3 Troubleshooting
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