I have no audio for HBO Now, but, I do have audio for Crackle movies. I restarted Apple TV as suggested, but, no go. I had audio and HD video for HBO Now previously and saw a number of shows and movies, but, something isn't allowing audio now. Maybe a person cannot have a computer online and Apple TV simultaneously, for HBO Now. I will try it both ways.
Crackle movies are high definition, but, I have had a few times when the video is in a lower quality video and do not want to watch it in that. But, that problem was last week and it is OK now.
I have a mid range 300 MBS U-verse. I am considering going up next month, but, we have been OK with this level of service.