When I turned on my Apple TV today it said that there was an update available. I installed the update and checked all the general settings to make sure they were the way I wanted them. It recognizes my iTunes account. We even watched a movie that we rented from there tonight. But when I go to the computer section it doesn't list my iMac. Home sharing is turned on both machines. I have airfoil on my iMac and I played some music from Pandora on the iMac to the Apple TV. I can't figure out why it doesn't see my iMac so I can choose content from iTunes to play on my Apple TV. Edit: I turned off home sharing on my iMac then turned it on again. Must have reset something because now the apple tv is seeing my iMac.