My problem is that my monitor keeps turning black and whatever sound was playing just loops. The reset button does nothing, and i have to shut the comp down with the psu on/off button. This happends alot during games, but the wierd thing is, is that curtain webpages will trigger it too, like wiki, certain myspaces and stuff like that. Like ill be on a certain page, and it will go black, then i restart, go to that webpage again, and the exact same thing will happend, and i can do this over and over again. Im guessing its not the video card since the whole computers locking up, im not just losing the video card signal. I know its not a heat issue, ive ran memtest, defraged, ran scan disk, update my video drivers, and that hasent helped.