I have a desktop computer with an Nvidia 9700 GTX graphics card. I'm using the DVI port on the desktop with the Mini-Display Port DVI adapter to plug in to my mid-2011 iMac Thunderbolt port.

I boot the computer in Target Display Mode (holding T at startup), and all I get is the thunderbolt/firewire screensaver, not my desktop.

I'm assuming their might be a different adapter, or that I need a different graphics card? I'm willing to shell out the money, just haven't found a concrete answer on the internet. Thanks.