Apple MA711LL User Guide - Page 32

 Make sure the volume on your TV or receiver is turned up and isn't muted.  Make sure you're using the correct audio cable (see page 13) and that it's connected firmly to Apple TV and to your TV.  If you're using the HDMI port on your TV and Apple TV, make sure your TV supports audio through its HDMI port. The HDMI ports on some older TVs support only video. If Apple TV doesn't appear in iTunes  Make sure Apple TV is turned on and connected to your network. Go to the Settings menu on Apple TV, select Network, and see if Apple TV has an IP address.  Choose Preferences in iTunes, click Apple TV, and make sure "Look for Apple TVs" is selected.  If Firewall is on (in the Sharing pane of System Preferences), make sure "Apple TV Sharing" is selected to allow content to pass through the firewall. If other Apple TVs show up periodically in your iTunes Devices list  This means that iTunes has found other Apple TVs on your network. To prevent this, choose Preferences in iTunes, click Apple TV, and make sure "Look for Apple TVs" is not selected. If Apple TV isn't playing your photo albums or slideshows  Make sure you have photos in your photo library or in a folder on your computer. 32 Chapter 4 Problem? No problem.