Every time I hook up my ipod nano gen. 4 with my ibook G4 it says my ipod is synced with another iTunes library and that an iPod can be synced with only one iTunes library at a time. I have two other ipods and I don't have this problem when I connect those with the laptop. Can anyone help here? Thanks. One other issue I'm having with my new ipod is when I synced my music library with it from my iMac it "grayed out" all the music that was put on the ipod. I've seen it do this before, but I can't remember how I fixed it.