I had a very old computer with itunes on it. I had to move that to an external hard drive. Got a new computer and accidentally erased the external hd so the only place my music exists now is on my ipod. I need to sync on new comptuer w/new empty library but I can't because I am told that the ipod is already synced to another library. But that library does not exist anymore and I can't open it to deauthorize-or anything else really. I have no idea what to do!