I have a wite macbook core 2 (from July 2006). The other day, the song I had playing on iTunes stopped on it's own. I couldn't get to iTunes to quit the program, so I tried to force quit. That didn't work. Instead the computer shut down on it's own, and now, when I turn it on, it shows the plain grey screen for a few mintues, the hard drive makes some weird grinding noises, and then an icon of a folder with a ? starts blinking in the center of the screen. what does this mean? is my macbook FUBARed!?