I was using onboard video no problems just rubbish as we all know. I bought this GTS250 yesterday and fitted it np's. I ran 3dmark 06 3 times and got results around the 12,222 point. I was happy enough and then went onto CoD4. After the intro and everything as soon as i got into the main game WHAM - off went the monitor & the repeated few seconds of audio. Forcing me to shutdown the machine and reboot. I then checked the power cables (2x6 pin) and tried to run 3dmark again. Same thing happened with this now.
I dont wanna send the card back incase its ok and it costs me a bomb in fee's n postage lol!