Hello, My computer is experiencing the BSOD at random intervals, and I'm not quite sure what to do to diagnose it. It typically happens when I'm playing video games for a while (rarely when it first turns on), although I've had the guy on for a while and it will randomly have happened without me doing anything on it. Once it bsod's it will keep crashing on boot until you completely unplug the machine, let it sit for 30 seconds, then power it back up. First, an error message appears saying overclock failed, please change settings. If i shut it down and restart then it will work fine again...until it crashes 30 mins-1 hr later. I just changed the power supply with one I had laying around (580 watts - modular cords, good supply) and keep having the same issue. I downloaded a temp program speedfan which is saying my cores are between 51-56, and this is right after playing, and high 40's when just surfing the web. Plus the case is lying competely opened, so heat shouldn't be the culprit? When my system arrived I had an issue with one of the sticks of ram, and corsair replaced it, so unless something has broken since then it shouldn't be the RAM either. My system is: Intel 2 quad duo CPU at 2.5ghz (4 cores) 2 * 2048 Corsair DDR2 1066 ram sticks (although for some reason in dxdiag is says 3326 mb ram?) ATI Radeon HD 4800 series, with 2913 mb ram 500 gig @ 5400 RPM Seagate drive ASUS P5Q-E LGA 775 Intel P45 ATX Intel Motherboard Windows Vista home edition. Any suggestions for troubleshooting this would be much appreciated, I have no idea how to tell what is failing, especially how to diagnose what the BSOD's mean, and how to tell if its the mobo?