My PC power goes off after starting. If I change the power cord to another socket on my surge protector, it sometimes can be restarted. Sometimes after I wait for awhile and then change the socket, it will come on. Sometimes for a few minutes and sometimes for hours. I suspect a heat issue. All fans are running. Could there be a problem in the power box? Any ideas? Last time I checked the CPU temperature was 52 degrees centigade.