After a little effort, I got the Apple TV configured. Everything seems to work, except I am not getting any sound from it when I try to play content (I tried a free TV shows as a test).
I know the HDMI cable is OK, it's the same cable I use with my Roku box. Using the volume controls on the remote makes the LED blink, but nothing else happens. I even tried using AirPlay with an iPad app that generates sound, but nothing was heard.
Any ideas?