Lenovo 7D8T, Maintenance Manual

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a. Press
Ctrl+Alt+Delete
.
b. Turn off the server by pressing the power-control button and holding it down for 5 seconds.
c. Restart the server.
d. If the server fails POST and the power-control 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.
Unexpected shutdown with LED not lit
Complete the following steps until the problem is resolved:
1. Check the XCC event log, and resolve related errors if found any.
2. Reseat power supply.
3. If the error recurs, replace power supply.
Memory problems
See this section to resolve issues related to memory.
Common memory problems
• “Multiple memory modules identified as failing or disabled” on page 184
• “Displayed system memory is less than installed physical memory” on page 185
• “Invalid memory population detected” on page 186
PMEM specific problems
• “Extra namespace appears in an interleaved region” on page 186
• “Migrated PMEMs are not supported” on page 186
• “PMEMs installed in wrong slots after system board replacement” on page 187
• “After PMEMs are reconfigured, error messages and LEDs persist to indicate PMEMs are installed in
wrong slots” on page 187
• “Cannot create goal successfully when installing PMEMs to the system for the first time” on page 187
Multiple memory modules identified as failing or disabled
Complete the following procedure to solve the problem.
1. Check XCC log to see if one of the disabled modules is malfunctioning. If so, replace the malfunctioning
module and start the system to see if all the modules are properly recognized.
Note:
When one memory module is malfunctioning, the system will execute memory downgrade to the
closest supported combination, while some installed memory modules will not be recognized by the
system.
2. Reseat the memory modules; then, restart the server.
3. Remove the highest-numbered memory module of those that are identified and replace it with an
identical known good memory module; then, restart the server. Repeat as necessary. If the failures
continue after all identified memory modules are replaced, go to step 4.
4. Return the removed memory modules, one at a time, to their original connectors, restarting the server
after each memory module, until a memory module fails. Replace each failing memory module with an
identical known good memory module, restarting the server after each memory module replacement.
Repeat step 3 until you have tested all removed memory modules.
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ThinkEdge SE450 Maintenance Manual