Hi, my girlfriends parents pc has had some problems. Its a fairly old pc but still just works! Basically when you start it up some times it just stops at the first boot screen. After turning it off and back on a couple of times it starts up. Any thoughts? I'm maybe leaning towards the psu but i'm not sure and dont want to have to try replcing too much stuff as they might aswell just get a new one if they do that!