A few weeks ago I noticed my fan was running alot. So I would shut the PC down and let it set for a couple hours to aid in cooling it down. Well yesterday I was playing a flash game online and all at once the computer shut off. I figuered maybe a power surge or the power went off for a spilt second, even though the lights did'nt flicker. Upon trying to power back up I received an error screen saying something about a thermal problem being the reason for the shutdown. The options were either press F1 to continue or F2 for setup. I pressed F1 and it shut off again. This time I waited a few minutes and retried, this time I when I pressed F1 it started. Well it happened again today and now I'm wandering if there is a problem with the fan or if it may be something else. I am not very computer savy so any help will be greatly appreciated, just bear with me if I ask alot of questions as I don't know the ling and terms very well.

Thanks alot in advance Harry