Ok, so I have recently built a new PC, bought a pair of Sennheiser PC363D to use, which work perfectly fine, but with or without the headphones plugged in, sound does not come through my TV, I have my TV connected to my PC through the HDMI port on the graphics card, I've even tried using a cable I have which is red & white on one end for which I assume is for audio ports & it has a green jack on the other end, plugging the red and white into audio out on my tv & the other end into the headphone port on the pc, the line in, speaker out, tried a few, no different result with any!?