I can no longer get my appleTV to show up under devices in itunes. I have the latest version of itunes running. The appleTV is plugged into the router by an ethernet cable and can access the itunes store fine. When I try and sync it with my PC i get the number to type in but nothing shows up on my PC. I have tried turning off the option to look for an AppleTV under preferences but nothing has happened. I have even tried reinstalling itunes with no success. The weird thing is, if I unplug the ethernet cable, everything works fine. I doubt it is the cable that is causing the problem and Apple have told me to change my ports that are open on the firewall but I have no idea how to do this, also until last week it has been working fine through the wired connection and I haven't changed anything on my router? Can anyone help me before my AppleTV becomes useless?