Processor Problems; Serial-Device Problems - Lenovo ThinkSystem SR850 V2 Maintenance Manual

8. See "Power supply LEDs" on page 224.
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-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.

Processor problems

See this section to solve problems related to a monitor or video.
• "The server goes directly to the POST event viewer when it is turned on." on page 248
The server goes directly to the POST event viewer when it is turned on.
1. Check the light path diagnostics LEDs and the XCC event log, and resolve any errors that have
occurred.
2. Make sure that the server supports all the processors and that the processors match in speed and
cache size. You can view processor details from system setup. To determine if the processor is
supported for the server, see
3. (Trained technician only) Make sure that processor 1 is seated correctly
4. (Trained technician only) Remove processor 2 and restart the server. (3 and 4)
5. Replace the following components one at a time, in the order shown, restarting the server each time:
a. (Trained technician only) Processor
b. (Trained technician only) System board

Serial-device problems

See this section to solve problems with serial ports or devices.
• "Number of displayed serial ports is less than the number of installed serial ports" on page 248
• "Serial device does not work" on page 249
Number of displayed serial ports is less than the number of installed serial ports
Complete the following procedure to solve the problem.
1. Make sure that:
ThinkSystem SR850 V2 Maintenance Manual
248
https://static.lenovo.com/us/en/serverproven/index.shtml