Have you used drive eraser to clean the system of drivers and then reinstalled the drivers? If not, I would do that.
My second thought since I had that card in an older computer I used to own. (BTW, nice card):
Some times when the ATI drivers don't work, you can get better success with the Omega drivers. Here is a link if interested that tells you how to uninstall others and then a link for Omega and the way to uninstall the old drivers:
Before you start this full uninstall procedure, make sure you have downloaded and installed the latest version of Driver Cleaner; if you are using other drivers then a special version of Driver Cleaner is already included.
Driver Cleaner Link
Clean procedure to remove old drivers
1. Go to the Windows Control Panel, Add/Remove Programs section.
2. Uninstall the ATI Control Panel or Catalyst Control Center, don’t restart.
3. If uninstalling the Omega Drivers, uninstall Radlinker (if using an old driver set).
4. Uninstall the existing driver set, restart.
5. Boot your PC in safe mode.
6. Run Driver Cleaner, restart afterwards.
7. If uninstalling the Omega Drivers, now uninstall the Setup Tools from the Start Menu.
8. Now you can install any driver you like.
Here is the link to Omega Drivers:
http://www.omegadrivers.net/
My second thought since I had that card in an older computer I used to own. (BTW, nice card):
Some times when the ATI drivers don't work, you can get better success with the Omega drivers. Here is a link if interested that tells you how to uninstall others and then a link for Omega and the way to uninstall the old drivers:
Before you start this full uninstall procedure, make sure you have downloaded and installed the latest version of Driver Cleaner; if you are using other drivers then a special version of Driver Cleaner is already included.
Driver Cleaner Link
Clean procedure to remove old drivers
1. Go to the Windows Control Panel, Add/Remove Programs section.
2. Uninstall the ATI Control Panel or Catalyst Control Center, don’t restart.
3. If uninstalling the Omega Drivers, uninstall Radlinker (if using an old driver set).
4. Uninstall the existing driver set, restart.
5. Boot your PC in safe mode.
6. Run Driver Cleaner, restart afterwards.
7. If uninstalling the Omega Drivers, now uninstall the Setup Tools from the Start Menu.
8. Now you can install any driver you like.
Here is the link to Omega Drivers:
http://www.omegadrivers.net/