Power Problems; Processor Problems - Lenovo ThinkSystem SD550 V3 User Manual

• The DIMMs are fully seated with lock latches fully closed.
• The LEDs on the power supply do not indicate a problem.
• The processors are installed in the correct sequence.
5. Reseat the following components:
a. Front operator panel connector
b. Power supplies
6. Replace the following components and restart the server each time:
a. Front operator panel connector
b. Power supplies
7. If you just installed an optional device, remove it, and restart the server. If the server now starts, you
might have installed more devices than the power supply supports.
8. Implement the minimum configuration (one processor and one DIMM) to check whether any specific
components lock the power permission.
9. Collect the failure information by capturing the system logs and provide it to Lenovo support.
10. See "Power supply LED" on page
Server does not power off
Complete the following steps until the problem is resolved:
1. Determine whether you are using an Advanced Configuration and Power Interface (ACPI) or a non-ACPI
operating system. If you are using a non-ACPI operating system, complete the following steps:
a. Press
Ctrl+Alt+Delete
b. Turn off the server by pressing the power button and holding it down for 5 seconds.
c. Restart the server.
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
(system board assembly).

Power problems

Use this information to resolve issues related to power.
System error LED is on and event log "Power supply has lost input" is displayed
To resolve the problem, ensure that:
1. The power supply is properly connected to a power cord.
2. The power cord is connected to a properly grounded electrical outlet for the server.
3. Make sure that the power supply AC source is stable within the supported range.
4. Swap the power supply to see if the issue follows the power supply, if it follows the power supply, then
replace the failing one.
5. Review the event log and see how the problem it is to follow the event log actions to resolved the
problems.

Processor problems

See this section to solve problems related to a processor.
• "The system goes directly to the POST event viewer when it is turned on." on page 275
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253.
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