Hey, I have a year old Core Duo White iMac. Sometimes the fans will go a bit fast and the top of the case gets very warm, I don't remember this happening a few months ago. This happens a lot when I'm in Windows and playing games, what can I do to prevent this? When I first got it, the iMac was completely silent and always cool - even when in Windows. What can I do to get the nice quiet and cool iMac I used to have?