my desktop screen goes black/blank all of a sudden like it's in sleep mode ( the power doesn't actually turn off at any point and there's nothing i can do to turn it back on except use the power button on the tower). if there is sound at the moment of the crash then it just loops rapidly again and again to infinity. i first dusted the tower and thought that was it since there was a huge amount of dust inside and after doing it worked fine for almost 2 days when it started doing the same thing again. the fastest it crashes is when i tried to play WoW (only a few minutes) and play youtube videos (10+ min). my graphics card is a geforce 210 512mb and i've had it for about a year, worked fine all this time. when i took it out last time it was really hot, i'm not sure how hot it's supposed to be but it burned my fingers more or less. i have the same system and components, i play the same games and run the same apps as i did before when it was working well ( i am not sure if i had any crashes of this sort in the past but i believe it did happen once or twice over at least a year). i don't play and high end graph games or anything that needs a better card. i use vista 64 on a intel quad email@example.com with 6gb. do you think it's the graphics card or something else? what can i do to find out? Thanks for help!