I turned on my Roku this morning and I have no sound. The Roku is not muted. The right input is selected on my TV. I swap the HDMI cables and I still have no sound. I changed the HDMI to a different input and I still have no sound. The sound still works when I go to the TV and computer input. I have a Roku ultra. I already tried unplugging it and resetting it. to me it looks like there's something wrong with the Roku ultra box what do I do now?