@Jimm - thanks for the reply. I had a feeling it could be the gfx card too. But i just wanted to rule out other casues. I have still like 2.5 yrs waranty on the gfx card, but just wanted to be sure.
and another funny point... sometimes when it crashes a lot while windows is on, i get BSOD(Blue screen error) but even that is Distorted :P
Also could it be a ram or PSU problem?
Sorry for my persistance.... but just want to be sure. Just dont want to get the gfx card replaced just to find it happen all over again. Thanks guys