What the hell was that?

[bussinessmenss]

I have OCed my GPU to 715/910 and it was stable till date only once or twice it crashed while playing GRAW.Then yesterday I played "Bioshock" at medium resolution and high details.I was well pleased to see how my card gave the fps of betn 30-50.The gameplay also was smooth.Then suddenly after playing for a while it crashed (BSOD) and my rebooted.It happened for two or three times.Then I shut down my PC,watched TV for a while and again when I boot my PC there was no signal on my monitor but I heard the welcome sound.Then I poped out my VGA and boot my PC with onboard it ran well.Then again I poped in my VGA card this time it worked.Then I played Bioshock again in the default setting of VGA card and medium setting of game it worked well.So can anyone tell me what had happened?

[Bluteg]

nevermind

[Nitrosport]

Do you have vista? I just built a new pc with vista and Im experiencing issues with my graphic card's crashing. There's a glitch with Vista and it sometimes doesn't recognize your video drivers. It usually corrects itself within a few seconds though. You could have a smililar issue....

Im still pretty new at that stuff though so I suggest checking here for help:
www.evga.com
The people on the forums are really good with their pc's.

Good Luck!