I have a 9400gt nividia card that I used abt a year now, however i recently overclocked it while monitoring the temperature making sure it didn cross the limit. Now this was just an experiment to see if the card would perform better so it was only done once with no difference in performance. So I forget abt every trying that again and continued playing my games normally. Two after if working perfecting and the third day, its not even recognized in the mother board but the fan is still spinning so i guess its still getting power. How do I know for sure its dead and not a bios problem or something. Any help would be appreciated , thanks!