but when powering on after a complete shutdown my pc works fine? I posted my issue here: http://forums.anandtech.com/showthread.php?t=2288629 but I think it may be a hardware (particularly psu issue) and not an OS issue. Basically, when I restart, my pc loops, doesn't even get to BIOS and no beeps. When I shut the pc down, then power it back on, it boots fine. The pc is a headless server.