So i'm connecting my tv via hdmi to my pc , i enabled AMD HDMI output in the sound panel . but the sound still comes out from my headphones . I am useing an Xi-FI surround pro external sound card if that's an issue ?
I am not sure if this is a applicable to your particular graphics card, but when I was using a GTX 250 or something like that , I needed an spdif cable to get sound to my graphics card to send it via hdmi. That may be the case for you.