Apple TV (3rd generation) - Manual (Page 27)

Chapter 4 Problem? No Problem. 27 Chapter 4 Problem? No Problem.
Status light
The status light on the front of Apple TV indicates what’s happening.
If Apple TV is The status light
On Glows
Off or in standby Is off
Starting up Flashes slowly
Accepting a command from the remote Flashes once
Rejecting a command from the remote
(you paired a remote with Apple TV, but
you’re using a remote that’s not paired) Flashes three times
Having problems Flashes quickly
Additional steps
If Apple TV doesn’t respond to the previous steps, try the following.
If you can’t hear sound
 If Apple TV is connected to a receiver, make sure the receiver is turned on.
 Make sure the input setting you selected on your TV or receiver matches
the input your audio cable is connected to. For more information, see the
documentation that came with your receiver.
 Make sure the volume on your TV or receiver is turned up and isn’t muted.