Apple TV (2nd generation) - Manual (Page 31)

Chapter 4 Problem? No Problem. 31 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