If you have sudo privileges you should be able to run
sudo yum install system-config-display
to generate another xorg.conf file. On other distributions I've had success just deleting the file (preferably just renaming to xorg.conf.old) and rebooting. The system would then detect hardware and apply a default configuration.
This might help: http://www.ghacks.net/2009/01/14/fed...ution-of-xorg/