I cannot sign into my itunes account on my apple tv. I have the appleTV synced to my brothers computer which has his own apple ID. What I want to do is log into my apple ID on the appleTV, since I have a large gift card on the account, but appleTV is not happy about that. Is there something that I am missing? or is appletv only able to access the itunes account on the synced machine? (which sucks). please can someone help.