• After changing or replacing a memory module, memory configuration is updated accordingly 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 memory modules, and then restart the server.
3. Check the POST error log:
• If a memory module was disabled by a systems-management interrupt (SMI), replace the memory
module.
• If a memory module was disabled by the user or by POST, reseat the memory module; then, run the
Setup Utility and enable the memory module.
4. Run memory diagnostics. When you start a solution and press the key according to the on-screen
instructions, the LXPM interface is displayed by default. (For more information, see the “Startup” section
in the LXPM documentation compatible with your server at
https://pubs.lenovo.com/lxpm-overview/.) You
can perform memory diagnostics with this interface. From the Diagnostic page, go to Run Diagnostic ➙
Memory test.
5. Reverse the modules between the channels (of the same processor), and then restart the server. If the
problem is related to a memory module, replace the failing memory module.
6. Re-enable all memory modules using the Setup Utility, and then restart the server.
7. (Trained technician only) Replace the system board.
Invalid memory population detected
If this warning message appears, complete the following steps:
Invalid memory population (unsupported DIMM population) detected. Please verify memory configuration is valid.
1. See
“Memory module installation rules and order” on page 41 to make sure the present memory module
population sequence is supported.
2. If the present sequence is indeed supported, see if any of the modules is displayed as “disabled” in
Setup Utility.
3. Reseat the module that is displayed as “disabled,” and reboot the system.
4. If the problem persists, replace the memory module.
Monitor and video problems
Use this information to solve problems related to a monitor or video.
•
“Incorrect characters are displayed” on page 199
• “Screen is blank” on page 200
• “Screen goes blank when you start some application programs” on page 200
• “The monitor has screen jitter, or the screen image is wavy, unreadable, rolling, or distorted” on page 200
• “The wrong characters appear on the screen” on page 200
Incorrect characters are displayed
Complete the following steps:
1. Verify that the language and locality settings are correct for the keyboard and operating system.
2. If the wrong language is displayed, update the server firmware to the latest level. See
“Update the
firmware” on page 177.
Chapter 8. Problem determination 199
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