Video card problem?

[W.J]

Well I'm not too sure, but I thoguht its my video card thats the problem when i play (7800 GT) now this is what i know
I used to play in game and i would get crashes, video would crash but sound would repeat or something stupid

Now im wondering if its even still the video card or the motherboard (DFI infinity p965-s)
now when i boot up, i get no beeps, and i just noticed that there is no usb since the lights in the mouse / keyboard do not light up. i looked at the fan on the video card and noticed that it spins, any help is greatly appreciated. thank you.

 

[W.J]

I just booted it up with teh video card unplugged, when its unpluggged the usb goes on and i hear the proper beep for video card error(no card in of course) should this confirm that the video card ist he problem? since when the video card is in is when i get no beep, and hte light on the mouse goes on then flickers off.