has anyone experienced this on their 15" albook? My computer wouldnt recognize any cd that I put in, when I opened up itunes it would say -50 itunes yada yada, quit ircle got a -50 put source error, then tried restarting and the machine wouldnt, just saw the dial spinning, shut it down and zapped the pram, everything is all better. Just wondering what the hell that was. Any ideas?