My parents have a Compaq computer they got in 2003. They only use it for some internet stuff and email. It just shut down one day and it normally won't start up at all. I looked at it for a while today and I got it going and was on the internet for about 5 minutes and it just shut down. The power light is on but nothing works. I need to hold the power button for about 5 seconds and then the power light shuts off. Then I can try to restart it but normally it runs for a couple seconds then shuts off again. I never got a warning about temp being too high or anything. It just shut down. Any ideas what the problem could be?