I bought a WD 320 Gig 5400 RPM hard drive for my new White NVIDIA MacBook. I stuck it in an external casing, copied everything to it with the "restore" feature, and swapped out the hard drives. I rebooted the computer with the new hard drive, and it didn't work. I did some hard drive swapping last year on my old MacBook and everything was a breeze. I don't know what I did wrong this time. Any ideas?