Basically when I power on my PC sometimes it'll just spin all the fans at max but nothing will happen. I hard power off and most of the time it comes back on. Today it just wouldn't have it. All cables are in, but taking the PSU cord out and leaving it for a short while, then pluging it back in seemed to have sorted it this time. My system seems perfectly stable in games e.g. played WoW all day yesterday.
My voltages seem ok..but they are lower than when I'm in the bios. My bios reports my 12v line as 11.97 or something. It's annoying me now...I can't really swap any components either.