That should be ok to fix. Ok under RH7 you can use
the older XF3.3.6. But what ya need to do is get
the kernel 2.4.5 and go into video options. Turn
on support for the ATI rage grahics card. It worked
for my VOODOO3. Then to config Xf86.
Xconfigurator --preferxf3. To use the older server
cause it seems to work a lot better than XF4.0.
hope that helps