Since updating to OS X 10.7.4 I am no longer able to synch my Apple TV with iTunes on my 21.5" iMac. The Apple TV appears on the list of devices in iTunes and is connected to the internet, but it will not synch with iTunes on my computer. Also since the update I am no longer able to wirelessly print files and can only print by connecting my printer cable. Looking at the community pages I suspect the problem lies with Bonjour and this may have been affected by the update. Has anyone experienced similar problems, or can you offer help to overcome this frustrating issue?
Navigate to Settings > Computers > Your Library on the Apple TV, you may be told you will lose all synced content, but you can sync it back afterwards, you won't lose any purchased content that has yet to be transferred. Then select Settings > Computers > Connect To iTunes, note the passcode that appears on screen, click on the device in iTunes and enter the passcode when prompted.