Hi all. I hope someone can help me, I have been struggling with this problem for 5 months now... PC Specs: Intel Core i7 920 OC'ed to 3.4 GHz (Cooler Master V8 cooler) 6 GB RAM DDR 3 Tripple Channel Asus P6T Motherboard 850 PSU Packard Bell Maestro 222Ws LCD (using DVI, also tried HDMI) 1 TB Hard Drive 2 x (HIS) ATI HD5850s Crossfired ATI Catalyst 10.5 Windows 7 Professional 64Bit AntiVirus - Total BitDefendor 2010 No Overheating problems, PC well ventilated and AC in room. Problem: Everytime I start up a game, whether it be Just Cause 2, Sonic & Sega All-Stars, Supreme Commander 2 or any other game, I get a BSOD. But instead of showing the blue screen or restarting, my screen says "No Signal" and shuts off, while my PC is still on. The only thing I can do is restart my PC manually. This happens sometimes immediately when I start up a game, or after about 10 minutes of playing. And when I can play: smooth framerates at full graphics. I have tried formatting and reinstalling Windows, and reinstalling ATI Catalyst (from 9.10 to 10.5) but no luck. Even took out and reinserted the graphics cards. Also tried Regcure. No luck either. So everytime I get BSOD, I restart and get error message: Problem signature: Problem Event Name: BlueScreen OS Version: 6.1.7600.2.0.0.256.1 Locale ID: 1033 Additional information about the problem: BCCode: 3b BCP1: 00000000C0000094 BCP2: FFFFF88004B7D279 BCP3: FFFFF88005D80490 BCP4: 0000000000000000 OS Version: 6_1_7600 Service Pack: 0_0 Product: 256_1 Files that help describe the problem: C:\Windows\Minidump\060110-18517-01.dmp C:\Users\Marno\AppData\Local\Temp\WER-38048-0.sysdata.xml Please help me someone, don't know what to do. I beg you.