Power Problems; Network Problems - Lenovo ThinkSystem ST250 V2 Maintenance Manual

b. Connect the device to another port. If using a USB hub, remove the hub and connect the device
directly to the compute node. Make sure that the device is configured correctly for the port.
Intermittent KVM problems
Complete the following steps until the problem is solved.
Video problems:
1. Make sure that all cables and the console breakout cable are properly connected and secure.
2. Make sure that the monitor is working properly by testing it on another compute node.
3. Test the console breakout cable on a working compute node to ensure that it is operating properly.
Replace the console breakout cable if it is defective.
Keyboard problems:
Make sure that all cables and the console breakout cable are properly connected and secure.
Mouse problems:
Make sure that all cables and the console breakout cable are properly connected and secure.
Intermittent unexpected reboots
Note: Some correctable errors require that the server reboot so that it can disable a device, such as a
memory DIMM or a processor to allow the machine to boot up properly.
1. If the reset occurs during POST and the POST watchdog timer is enabled, make sure that sufficient time
is allowed in the watchdog timeout value (POST Watchdog Timer).
To check the POST watchdog time, restart the server and press F1 to display the LXPM system setup
interface. Then, click BMC Settings ➙ POST Watchdog Timer.
2. If the reset occurs after the operating system starts, disable any automatic server restart (ASR) utilities,
such as the Automatic Server Restart IPMI Application for Windows, or any ASR devices that are
installed.
3. See the management controller event log to check for an event code that indicates a reboot. See "Event
logs" on page 219 for information about viewing the event log.

Power problems

Follow this procedure 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.

Network problems

Follow this procedure to resolve issues related to networking.
• "Cannot wake server using Wake on LAN" on page 233
• "Could not log in using LDAP account with SSL enabled" on page 233
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