Hi everyone, new here. Recent owner of a 2.0 Alu Macbook. Had it for about two weeks with no problems whatsoever--until today. I usually have the computer sleep, but I shut it down today, and when I tried to restart, the laptop gets to the gray screen with the Apple logo and the spinning wheel (the gray one, not the rainbow pinwheel). After about two minutes, the computer shuts down and reboots again on its own. I've tried resetting the PRAM, tried booting up in Safe Mode (no go), and also tried the fcsk command thingy. All to no avail. Any advice would be appreciated. Thanks in advance.