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 ➙ Advanced 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 technicians only) Install the failing memory module into a memory module connector for
processor 2 (if installed) to verify that the problem is not the processor or the memory module connector.
8. (Trained technicians 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 62 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 323
• “Screen is blank” on page 323
• “Screen goes blank when you start some application programs” on page 324
• “The monitor has screen jitter, or the screen image is wavy, unreadable, rolling, or distorted” on page 324
• “The wrong characters appear on the screen” on page 324
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 289
.
Screen is blank
1. If the server is attached to a KVM switch, bypass the KVM switch to eliminate it as a possible cause of
the problem: connect the monitor cable directly to the correct connector on the rear of the server.
2. The management controller remote presence function is disabled if you install an optional video adapter.
To use the management controller remote presence function, remove the optional video adapter.
3. If the server is installed with the graphical adapters while turning on the server, the Lenovo logo is
displayed on the screen after approximately 3 minutes. This is normal operation while the system loads.
4. Make sure that:
• The server is turned on and there is power supplied to the server.
• The monitor cables are connected correctly.
• The monitor is turned on and the brightness and contrast controls are adjusted correctly.
Chapter 7. Problem determination 323
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