I have an odd problem with my system. I cannot install drivers later than the Detonator 53.03 drivers, or else the Direct3D tests lock up the entire system with the 'DirectX Dianostic Test' window showing up with a black clint area. This forces me to cold reboot.
On some games like FIFA 2004 and Freedom Fighters, for example, whilst a game is at the load screen each time the progress bar progresses the screen turns bright magenta intermittantly. Otherwise gameplay is fine. Toca Race Driver's graphics are unplayable as nothing appears apart from large, blocky magenta regions with smaller checkerboard like patterns of random colours - primarily magenta, black, white and green.
Other games like Doom III are perfectly fine.
I've checked for things like IRQ conflicts with the card and resolved those, but the problem persists.
I'm lost as to what it could be. I don't think that it's a memory problem, simply because there is no problem with Doom III and a few other games.
Thanks for your help!