solved following dpw2atox
I have been checking the forum and I have found a simple solutions provided by dpw2ato. The original subject was "Red Hat 9.0 and GeforceFX 5600".
You have to install Red Hat in text mode and change in the XF86Config the line that says vesa to nv. It is simple. Then you can run startx and modify the graphic card to a NVIDIA GEFORCE FX.