FC1 installed to boot into run level 3. Sign in as root and then startx. Black screen. Ctrl-Alt-F1 shows this screen:

(==) Using config file: "/etc/X11/XF86Config"
Several lines follow that count from 320X240 to 1600X1200 then:
Session_Manager=local/localhost.local domain: /tmp/.ICE-unix/1132
Audit: Sat Mar 20 1745 57 2004 1129 x: client 4 rejected from local host
Gnome_Message: gnome_execute_async_with_env_fds: returning -1

Followed by blinking cursor.

vi /etc/X11/XF86Config the settings appear to be correct, they closely match the settings I get in RH8.
RH8 is on my slave and FC1 on master.

Here is a solution.
Reboot at run level 3 and login as root, then

#XFree86 -configure
It will display some text and at the bottom of the text is the next command to run
#XFree86 -xf86config /root/XF86Config.new

You should see a blank screen with "X" cursor, hit Ctrl-Alt-Backspace to leave that screen and then
#cp XF86Config.new /etc/X11/XF86Config

note your old /etc/X11/XF86Config is saved as /etc/X11/XF86Config.backup

Reboot and hope this solves the problem.