I seem to be having some difficulty using my LG5000 TV as a second monitor. I am connected via an HDMI cable from the TV pluged in to a HDMI to DVI dongle connected to the second DVI port on my GTX275 card. I can display windows fine but for some reason i cant seem to get any sound from the PC on the TV. I have tried conecting the PCs audio to the TV via phono plugs to the R&L ports on the TV and PC but still no sound. Can anyone help please?