I am now on my 4th macbook (all others were horrible), and this one is perfect except for one thing. The entire thing vibrates constantly. I know its the harddrive. The three white macbooks that i had before this all did the same thing as well, all though the degree of vibration varied amongst all of them. I was at an apple store last weekend and checked the macbooks there, and every white one vibrated, yet none of the black ones did. I guess my question is, is this a problem? It seems a little strange to me that most, if not all, white macbooks do this.