I recently purchased an iphone 4 to replace my iphone 3G. I synced directly with my laptop and everything made it to the phone except the music files - including purchased applications. After a dozen attempts, I can't get any of the music files to transfer. I let it run all night and it just stays in the "sync in progress" mode forever. I've tried everything including limiting to the "purchased playlist" only that is pretty small and it still doesn't take it. What am I doing wrong?