TV Tuner But No Sound

Hi Guys. I have an ATI TV Wonder 550 on an OLD HP Pavilion 7915. It has a Realtek 97AC Audio on it. NOW i have HT TVR installed on the box and I can see the channels fine. I can't hear out of it. This has me thrown for a loop. I have tried all teh audio inputs. there is one taht says TV-TUner Audio and its turned all the way up and I still can't hear from it. What should I do? I have tried all the audio options and I still can't hear from it. What should I do?

 

To save me investigating, do you have only one set of audio connections or are there some built into the motherboard as well as on the ATI card?

Do your audio functions work? Can you say, stream music over the internet?