Hi, I am the proud owner of a 2.53 GHz Macbook Pro for 10 days now. and it has happened twice already, that I - after working on it for a while - close the lid, put it in a bag..... and it gets HOT!!! as in: burning hot! while in sleep mode - how can that happen? the first time it woke up immediately, started fanning and everyhting was cool... or at least cooler.. today it did not wake up, i had to force it to shut down, and then restart it. should i worry and take it back, or did i do something wrong?