Hello, I am trying to run my cable box through my avr-789 and i am not getting volume into my television. I am getting picture but no sound. I have a hdmi running from the reciever to the tv. also i have tried both a straight hdmi to the reciever and a regular rca's for sound. I know that in the menu setup that i have to have the audio to "tv" and not amp/reciever (not sure exactly what it says) but i still got nothing. I am wondering if this is possible or if it is strictly for surround sound audio.. thanks