Help! Pc rebooted during gaming, wont post

[otapnam]

Hey guys i was playing l4d2 and my pc abruptly crashed, now it wont boot and the fans spin and spin fast. I tried unplugging my video card and the computer then spins up normal again, but i dont have a spare card to test right now.

So what do u guys think? Psu? Video card? What should i try replacing first?

Ocz modstream 700 w psu btw, rest of specs in sig. Ive also unplugged unneccesary drives, etc

Edit - the red led on the corner of the 6970 is on when i run the system with the card seated but unpowered

Edit 2 - the led on the mobo has no code either and does not beep on boot

 

[Dangman]

Did you make sure to fully connect all the power plugs to the video card?

The GPU would be my first choice to replace or get a spare for.

 

[otapnam]

The system was running fine before - i dont think its a gpu issue and am going towards the motherboard being dead now

EDIT - however i am going to go pickup a cheapy vid card @ frys after work tonight and test that out