Hey, i've recently done a clean install of Mac OSX but had a backup of my iTunes music so i could restore that. I've just plugged my iPhone in to sync it as I had added some extra songs to my library but it said that because the iPhone was synced to another library i would have to delete and replace so I agreed to that and let it sync. I noticed that it was only syncing 900 songs (my library is over 2000) and when it had finished there was a message on my iPhone saying that iTunes was unable to sync 1739 songs "see iTunes for details" but there is absolutely nothing showing on iTunes that seems to explain anything. I'm sure i've done the de-authorise/authorize business right when doing the clean install and can't figure out what to do to get all my music onto the iPhone. Has anyone got any ideas? Thanks ---------- OK, i pressed sync again and it seems to be transferring the rest over. Very odd. SOrry for the waste of a thread.