Ok where do i start, my 13 yr old son has my old pc a amd 3800 x 2 socket 939 running at 2500mhz on a dfi sli lanparty expert. Problem is son was using it the other night when smart gardian started sounding off so he shut it down. Found that the chipset fan was on the way out so have replaced that with a thermaltake hr 05 sli passive cooler, but since putting everything back together the 3.3voltage from psu is only 1volt if that. The pc boots fine into windows temps are ok, could this just be psu or is the motherboard damaged ? Psu is a targan tg480-u15 modular 480watt psu. Also what wouls be a good replacement?