Remove the side cover and point a fan at the open case.
If the crashes stop you have proved that some card or part is now heat sensitive. The screen leads me to think it is the video card. I'd do the cover off test first.
computer crashed?about 2 months ago. cleaned it, added some ram total now 512.computer runs,if i open documents pitures,etc,its ok.however if i try to run symantec or read my emails it will give me a few minutes and then goes to this blue striped screen and i have to shut down computer and restart.oh, i also changed the battery on the mb someone said they can get weak,perhaps causing problem beyond that he suggested possible mb chip.
i'm a newbie trying to learn a little appreciate any help i can get.