I have 2 Nvidia cards: 9800gtx+ 1gb and GTX 470. I have the GTX 470 as a primary display and the 9800 is hooked up to the TV via S-Video.
In the past (maybe 2 weeks ago), I could use the TV for extending or cloning my desktop. It has suddenly stopped working and I'm totally frustrated. When in Nvidia Control Panel, I can see both cards and I can see that the TV is recognized by the 9800gtx. However, it is not selected, and when I select it and hit "apply" nothing happens and it just goes back to being unchecked.
Also, I have used 3 different drivers with this setup and it doesn't seem to make a difference. The most frustrating aspect of this is that it seems to have just changed without me doing anything- is this possible? Right now I am using the 260.99 drivers and I have also used the 260.89 and also the dev drivers that are out which I think were 261.
Thanks for the reply. I am embarrassed to say that the s-video cable was loose. I didn't realize it because it was somehow connected just enough to have that card show up in Nvidia Control Panel, but when I repositioned it I was able to extend the desktop. Time to buy a new one because this one no longer fits tightly.