Dual Monitor working on Win 7 but now Dissapeared

After I installed Windows 7, I had by tv connection still showing as a second monitor. Just the other day the display no longer shows anything but the sound is still coming from the tv. In properties the display only shows 1. I also tried detecting and nothing happened. I have a Radeon 9000 video card.

In device manager, other devices is showing video controller with a yellow !.
Monitor is showing - Generic Pnp Monitor
Display is showing Radeon 9250 9200 series

try uninstalling then reinstalling your driver in safe mode, without any AV running