Ok so here is what happened: My g/f has a new 2.0GHz Macbook and she had it plugged in to charge. The battery was indicated to be full, so she disconnected it, put in in her laptop bag, and then came over my apartment. When she got here, the Macbook was asleep, but the bottom rear portion (motherboard, optical drive area) was very, very, very warm to the touch and the fan sounded like a small jet turbine. I tried waking the computer, but it was unresponsive to any key or trackpad presses. Even pressing the power key was useless. Finally after pressing and holding the power key the computer apparently shut down completely. I let it sit for a few minutes and started it up again. Booted up fine but it said on start up that it restarted after Mac OS unexpectedly quit, and it appeared to indicate there was a kernel panic. The battery indicator now said there was 59% of the charge left, and over the next five minutes it dropped to 49%. It hasn't acted up since then (a few days) but apparently it restarted itself after an OS unexpected quit overnight last night too. Do you think this is just a Mac OS problem and it needs to be reinstalled, or do you think this warrants a hardware problem and bringing it back to the Apple store to try and get it replaced? As it is, we already went back to the Apple store a day after she bought it because the delete key was seated right and there was a small nick in the anodize on the corner of the lid out of the box. They fixed the key and said they couldn't replace it because of the anodize nick, and gave us a 10% off coupon for the store. Personally I think at this point they should just replace it. What are your opinions?