Hi, newbie here I'm facing a similar problem, my custom system is blue screening, randomly reboots etc.. and I have systematically been through every software/driver issue i can think of, but with no luck. I have basically replaced everything in my computer, except the PSU, I think this might be the problem, it's a 550w but its being used by a core 2 duo 2.40Ghz CPU, 2 X1950 PRO GPUs, MSI 975x MoBo, 2 HDs a DVD rom drive and 4 fans. I've tried removing a graphics card to lighten the load, but I'm still having frequent problems, mainly randomly rebooting. It seems fine unless my computers been on for more than 3 hours or until I play a full screen game like Oblivion or Rome:Total War, which leads me to believe that its and overheating problem, or too much strain on the PSU, I'm willing to replace any parts necessary to fix this problem, any thoughts? Btw Idle temps seem fine, so how can I see the temps of my CPU etc.. while I'm playing a game?