So my roommate got an iPhone for Christmas and I share my macbook with him (he logs in under Guest). When he opened his iPhone, he hooked it up to my macbook (while under Guest account) and created a new itunes profile on the macbook and synced it with his iPhone. Well he began making itunes purchases directly from the iPhone and when it came time for him to load some of his cd's onto the iPhone, no dice. I ripped a few of his cd's for him (under guest account) and tried to copy them over to his iPhone... but itunes says that his itunes library is on another computer?? :-/ I'm signed into itunes under his account but am still getting this error. I then try to select to manually manage songs on the iphone but it then wants to clear the music that is already installed. This would be fine if his itunes purchases (from the iphone) were on the macbook (under his account) but they are not listed. I then tried to backup the songs from his iPhone with Senuti - but it doesn't read ANY of the music on the iPhone... This is really strange because I've used this program many times with success on my iPod video and iPod Touch. I've tried everything I know to do... I really don't want to wipe his iPhone clean (by manually managing from itunes), throwing all of his purchases away.. What do you guys think?