Partially fried video card?

Hi,

So I was gaming on warcraft III on a 8600gt like I have done so for the past 2 years on this computer. All of sudden, background twitched, weird pixels started to poping out, I tried to alt-shift, it took a lot longer than usual, but eventually I managed to do so the desktop looks perfectly normal. When I alt shift back in, the screen went black monitor went into sleep mode, no single, I can still hear the music, I can still select unit via hot key, but the screen wouldn't go back up no matter what I did.

So I rebooted, everything is normal until I run any 3D games, the screen goes black and never come back, but there is music, and I interact with hot keys and the proper sound plays, so the system didn't crash. Movie and everything still works fine as long I don't play 3d games.

Can anyone tell me what happened to my system, is the video card the only component I need to replace?

my spec is:

q6600 2.4ghz, no OC
2x1 gb ram
asus p5k board
evga 8600gt
corsair VX450W

It could be drivers, try updating/reinstalling your drivers, download a driver cleaning tool to ensure that it's removed properly.