My PC is working good and I installed some games (crysis original, test drive unlimited, company of heroes, etc.). When I'm playing these or other games, after ~5-10 min. my PC is turning-off and then starts again. There isn't BSOD and any other error in Event Viewer. I also unchecked Automaticully Restart. I made a test with Prime95 and after 8 hours it gave me a FATAL ERROR: Rounding was 0.5, expected less than 0.4. My system is not overclocked, and everything in BIOS (last version 1005) is set to default. I formatted HDD and installed Win XP SP2, and then tested with Prime95 and again the same error. Then I installed all new Drivers for mobo and vga and tested and same error. I try to change the RAM from A1/B1 to A2/B2 but still no success. I havent any other components (RAM, CPU, VGA...) to try with them. ???