I have what i believe is called a HR 20 Silver. One of the early DirecTV HD DVR after TiVo. It was replaced last year by DirecTV, identical refurbished unit. To the point, I had been getting my Dolby Digital out via HDMI. However, I recently had the reason to go back to getting it from the Optical Audio Out on the back of the receiver. However, I can't get any sound from it all all, nothing (out of the optical port). And there is no red light coming out of the port. Does that mean the port completely failed, or is there some setting I have off? Many thanks.