That's weird... What type of monitor do you have? Flat screen? If so, try to raise the refresh rate. and what's the size of your video memory on your TNT2? It could have something to do with certain detonator drivers, try updating your detonator drivers at www.nvidia.com.

If that doesn't work. create a file called 'Cataclysm.ini' in your Cataclysm installation directory (where Cataclysm.exe is) and insert the following lines:

[Graphics]
32BitDepth=1
FullScreen=0
VSync=0
WinRes=3

This will start the game in windowed mode. If your screen's still black then, there might have been an installation error and the images and fonts were not installed. Try reinstalling the game.

I hope these things help. Good luck!

Coen