instead of typing in the user/pw at the GUI prompt hit the ctrl+alt+F1 to get to a terminal (dos looking screen) log in there as user, then su - and enter the root password.
at that point you can get in and edit your /etc/X11/XF86Config-4
as to what exactly you need to enter there you will have to get an ATI guy around here to help you with, or do some googling for your vid card with RH9...
you are not locked out of your system, just out of the GUI for now.
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