Don't copy from others otherwise I will report you.

You are dealing with a server system shutdown overnight and it will not power back on. You are able to restart the server the next morning via out of band management (IPMI) but the server goes down again later that day. You drive to the datacenter and begin troubleshooting why the system keeps shutting down. You notice that when you unplug the server and plug it back in, the system immediately starts back up. What could the faulty hardware component be?