Hello , I recently installed a lovely 42 inch plasma on the wall of a new private members club opened in SW London , which is used as a poker tournament clock . I plugged the lead from the graphics card into the TV and got a picture but I get no sound from the pc too the plasma any ideas . The pc with the poker software on runs in a room behind the plasma on the wall and has onboard sound . Do I have to buy a sound card and do it that way?