Comp screen goes black and sound stutters.. 8800gt oc

Hi again, Well I've recently noticed that While playing certain games (World of Warcraft, Heroes of Newerth) my computer monitor will just go black and I will hear an annoying kind of clicking sound threw my speakers.

The thing is, when I take the side casing off of my computer and face it out of my bedroom window to the cold air it won't do that "im assuming because that keeps the vid card cool"

All my drivers are up to date for my comp/vid card.

Nvidia 8800gt oc
2gb RAM
vista home 32bit
acer aspire M1100
AMD athlon 64x2 dual core 4400 2.3ghz
earthwatts 650W PSU w/ 3 rails @ atleast 22A on each rail.

I have tried RivaTuner for turning my videocard fan speed up by to no avail.


Though it's weird when I play WoW it wont black screen and make the noise, but if i let it sit the idle with WoW open'd after a while it'll do that. Please help !! or give suggestions.