That is my first guess too. Maleko, can you try with a different PSU? cheers for the replies guys! well, i did a system format, as i needed to do one anyway, and used my original XP CD (not using my nlite cd) to re-install. All seems fine, except i had a bsod when loading some programs, i was loading about 6 apps at once, so may have been be rushing then had one from my display driver nv4_disp.dll bsod when chaging settings in a game. although random bsod's dont seem to be happening, only have happened when i was doing something this time. now, i have been curious if my psu was powerful enough now, 500w antec truepower powering: 8800GTS, Opeteron 175, x3 hard drives, x2 rom drives, floppy drive, 4 case fans and lots of usb devices. so maybe that is an option, unfortunately i cant test another psu, id have to buy one. all my drivers are WHQL, and all latest. oh, and nothing is overclcoked now, took it all back to stock.