Hi I have a new PC AMD Quad core phenom with a 450w PSU and a 1GB 9800 Nvida Card.. The PC was working fine but then every now and again the PSU made a funney loud whiring noise on startup that then went quiet... Twice noe in games the PC has just cutiut and died it will restart straight away but the case and PSU is redhot to touch... DOes this mean my PSU is screwed? Other Times like now its fine!