I have the black macbook. For the last week or so (I have had this computer a little over a month), it just randomly shuts off. Sometimes, it won't even finish booting. I can re-start several times, and eventually (so far, anyway), I can get it to stay on until I am finished using the computer. I have 10.4.7 (I think) installed. Any idea what this problem is? Any ideas/suggestions are appreciated.