This is a major headache for me at the moment. Unfortunately I'll need to gloss over some of the techie stuff at the moment until I can give a definitive answer. We currently have a client who has a requested an HP dc5750 Micro Tower, be connected to a Plasma screen in a training suite. So far, so good. We already had a graphics card in a Dell Optiplex gx280, which provided an HDMI output. They like HP's though. The problem was and still is, that we can output video without any problems, but, how should I connect the audio from the PC to the Plasma. In all my experience before, nobody has ever required audio from a PC to a Plasma. My initial thoughts is to use a 3.5mm mini jack from the audio output from the PC to the audio input on the Plasma. HELP!!!!!!!!!!!!!!!!