• There are few cases in which the memory error is relative to processors. Replace the affected
processors if the above actions does not help on customer’s situation (Trained technicians only).
4. Run the memory module diagnostics. When you start a server and press the key according to the on-
screen instructions, the Lenovo XClarity Provisioning Manager interface is displayed by default. From
the Diagnostic page, click Run Diagnostic ➙ Memory Test ➙ Advanced Memory Test. If any memory
module fails the test, repeat steps 2 and 3.
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 49 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.
DIMM PFA issue
1. Update the UEFI and XCC firmware to the latest version.
2. Reseat the failing memory modules.
3. Swap processors and make sure that there are no damages to processor socket pins.
4. (Train service only) Ensure there is no abnormal material in any memory module slot.
5. Run the memory module diagnostics. When you start a server and press the key according to the on-
screen instructions, the Lenovo XClarity Provisioning Manager interface is displayed by default. You can
perform memory diagnostics from this interface. From the Diagnostic page, click Run Diagnostic ➙
Memory test ➙ Advanced Memory Test.
6. Replace the memory modules that fail Memory Test.
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
• “Monitor display fails when connected to the VGA connector of the server” on page 325
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 283
.
Screen is blank
Note: Make sure that the expected boot mode has not been changed from the UEFI to Legacy or vice versa.
Chapter 8. Problem determination 323
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