Get rainbow screen on any serious video application

Installed new mobo, ga-965p-ds3 rev 1.3

When I try to play a game, or even do a artifact test in ATI tool, I get a rainbow screen or a screen with a pretty color.

After I installed Omega drivers, the computer would boot into a black screen, I would hear the windows sounds, then the computer would reboot itself again, back into basic mode, as I have to reset the screen res, but no option for Omega stuff

Video card is x1900gt.

It works for basic things though.

I have tried:
uninstall ati drivers, reinstall ati drivers
Install Omega drivers

I am having trouble finding anything in a google search.

Any suggestions?
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