d. If the server fails POST and the power button does not work, disconnect the power cord for 20
seconds; then, reconnect the power cord and restart the server.
2. If the problem remains or if you are using an ACPI-aware operating system, suspect the system board.
Memory problems
See this section to resolve issues related to memory.
• “Displayed system memory is less than installed physical memory” on page 349
• “Multiple memory modules in a channel identified as failing” on page 350
• “Attempt to change to another PMEM mode fails” on page 351
• “Extra namespace appears in an interleaved region” on page 351
• “Migrated PMEMs are not supported” on page 351
• “Invalid memory population detected” on page 351
• “PMEMs installed in wrong slots after system board replacement” on page 352
• “After PMEMs are reconfigured, error messages and LEDs persist to indicate PMEMs are installed in
wrong slots” on page 352
• “Cannot create goal successfully when installing PMEMs to the system for the first time” on page 352
Displayed system memory is less than installed physical memory
Complete the following procedure to solve the problem.
Note: Each time you install or remove a memory module, 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 memory module 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 module (see “PMEM rules” in Setup Guide for
requirements).
• 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.
• When PMEMs are installed:
a. If the memory is set in App Direct Mode, all the saved data have been backed up, and created
namespaces are deleted before any PMEM is replaced or added.
b. Refer to “PMEM rules” in Setup Guide and see if the displayed memory fits the mode description.
c. If PMEMs are recently set in Memory Mode, turn it back to App Direct Mode and examine if there
is namespace that has not been deleted.
d. Go to the Setup Utility, select System Configuration and Boot Management ➙ Intel Optane
PMEMs ➙ Security, and make sure security of all the PMEM units is disabled.
2. Reseat the memory modules, and then restart the server.
3. Check the POST error log:
Chapter 5. Problem determination 349
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