I'm getting blue screens (sometimes), while I play(only), and my PC reboots(always) after a strange sound lasting 2-4 seconds. or something like that. My PC is: GB EP35-DS3R, Q6600 at stock, 2X2GB 800mhz at stock, GB 4850 512mb at stock, 500GB Seagate, 550W Chieftec. The video card's temperature is ok - 75 degrees Celsius max. The hottest q6600 core is 56 degrees Celsius. The motherboard temperature is 42 degrees celsius. I ran memtest for 1 hour - no errors. I have the latest video and audio drivers and I'm almost sure that there is no problem with the video card, because there it's 3 months old - I had another 4850 but it was defected. So i think my PSU is the problem. Or maybe the CPU..i'm confused. Any ideas? Thanks in advance! Any help is GREATLY APPRECIATED. p.s. Sorry for my English, it's my second language.