I have a Compaq Presario 2100 Laptop. For the past 4 weeks it shuts down by itself. I took it to Fry's Electronics, they took it apart and found lots of dust, so I assumed it was a heat issue. I took the laptop home and turned it on. After 20 mintues the screen went blank, the laptop was still running, but I had to shut down. This morning I turned it on at 11:25 AM and it worked fine untl 2:30 PM. What could be causing the laptop to shut down? I have two screen shots of the temp of the CPU when I 1st turned on the laptop and the temp about 2-3 hours later. ...