I was surfing on my bed last night with my iBook, and fell asleep, with the pillow almost completely covering it. I woke up at about 5:30 to find that it was very hot, and something, which I hope is the fan was being very loud. In my still-half-asleep state, I couldn't tell whether air was blowing through the vents or not, but regardless, when I put it to sleep, what I assume was the fan stayed on. I'm asking this question because the fan (if there is one) has never come on before, so I'm making sure that a) there is a fan b) it's supposed to be really loud. The only thing I could think of as an alternative would be a (physically) crashing HD, which would, needless to say, be a VERY bad thing. Thanks!