Apple TV (2nd generation) - Manual (Page 27)

Chapter 4 Problem? No Problem. 27 Chapter 4 Problem? No Problem.
 If the Apple TV status light flashes once when you press buttons on the paired
remote, the problem isn’t with the remote. See “If you can see a picture but
Apple TV isn’t responding” on page 28.
 If you’re using an unpaired remote, the Apple TV status light flashes three times.
 If you paired Apple TV with an Apple Remote and you can’t find the paired
remote, set Apple TV to work with any Apple Remote by holding down Menu
and Left for 6 seconds on another remote.
 Make sure the front of Apple TV isn’t blocked.
 If Apple TV displays a picture of a remote and a warning symbol (·), you need
to replace the battery in the remote. See “Changing the Remote Battery” on
page 23.
If Apple TV can’t access the network
 Check the IP address Apple TV is using. If it starts with 169.x.x.x, the router or
base station may not be configured properly. Check to see if DHCP access is
available, or configure Apple TV with a manual IP address.
 Check for any obstructions, and adjust the location of the base station or
Apple TV.
 If security is enabled on the network, temporarily disable it on the base station
and try connecting again.
 Apple TV cannot connect to a wireless network that contains high (extended)
ASCII or double-byte (Unicode) characters (such as Japanese, Korean, or
Chinese) in the name or password.
 If your network has security enabled, make sure you enter the correct password.