My apple tv refuses to sync with my mac using either automatic sync or custom settings. It also disappears from itunes constantly and when it does show up again nearly always resets itself to the please register page. Also photos will not sync at all no matter what settings you use. All media (except photos) can be viewed on my TV via streaming. Have done factory restores and still no luck. Any suggestions before I chuck the whole thing off the roof of a very high building?