Hi, new to forum. I'm using a HDMI cable from packard bell pc to LG TV. and also have an optical cable from tv to yamaha amp. If I'm viewing satelite TV( Sky box), there is no prob outputting audio to the amp. But if I'm viewing video from the pc i can't get any audio, either through tv speakers or thru the amp. I presume then that the hdmi cable is only carrying video from pc to tv? Would this be correct?