I've had my new macbook air for about 2 months now, and I love every bit of it. It's quiet and it always feels cold, with the fan never going off. A couple of days ago however, I installed OS LION and I noticed that my mac will get hotter than usual. Not blazing hot, but it'll get pretty warm without me even watching a video, and wifi turned off. Somtimes, the fan will just randomly go off and I have no clue what's causing it. The first thing that comes to mind is OS LION. Can this be the reason causing all of this? I'm a little worried as I don't want my mac to heat up when it's not suppose to. Also, I would like to reinstall Snow Leopard. Is there any other way to reinstall it without using Time Machine? This is a noob question, but how do you use Time Machine? Thanks for your help!