I had it set up to where my computer extended my desktop on three different monitors (using 2 different video cards). My two main monitors were extending the desktop with my GTX 260 to my television and a computer monitor. It worked fine.
I recently found out that I could be streaming HD audio through my video card from my Motherboard using that cable that came with it. So I set that up. Now, trying through the nvidia manager or through windows, it will only allow me to DUPLICATE the displays attached to the GTX 260.
No matter what I do, I cannot get it to have my computer monitor by my main monitor with the desktop extended on to my television. I've tried both connecting the HDMI cable to my TV (The way it was before) and to my receiver (An Onkyo receiver).