So normally my Macbooks fans are hardly on and it runs really cool and quiet but this morning I turned it on for like 10 minutes and then off again and the fans were going crazy. Then when I got in from school, I turned it on liek normal and even now with just safari running the fans are goig wild. any ideas as to what might be causing this? I have had to turn off by holding the power button a coulpe of times b/c it wouldn't wake from sleep. what is it that I could try and reset and how do I do it? are there any risks? please help. I can't afford for something to go wrong.