I have the latest version of the Mac Mini with the updated software on my Apple TV 2. It can see my Mac Mini but when it try to access it's information with iTunes open I says it is loading but eventually errors out. I can ping successfully from my Mac Mini to the Apple TV. I have the latest version of iTunes. My MacBook Pro and Mac Pro can be accessed successfully on the Apple TV. All three are running Lion with the latest updates. The Mac Mini did at one time work on the Apple TV. The firewall is off on the Mac Mini. Any suggestions to get the Mac Mini and Apple TV to work again would be appreciated.