I just got a brand new iMac and I have all my itunes music on my External hard drive. And what I would like to do is have all my music on my iMac so I can listen to my music without the hard drive always plugged in. So what I did was plugged my hard drive in and copied the itunes folder on to my iMac then in iTunes, I went to: iTunes>preferences>Advanced and changed the itunes location to that folder. But when I disconnect my hard drive. None of my songs play and it says the files need to be located. What else do I need to do to be able to get all the songs to work in iTunes? Thanks.