X keeps reloading and doesn't show a display - please HELP

[Dan Track]

Hi

I've just installed Fedora 9 on my box, initally I got a standard
display on my LG monitor after that I swapped it for an NEC and then
ammened the monitor setup with system-config-display. However, now I
don't get a display X keeps restarting, at least that's what I think,
as the monitor power light keeps going from green to orange but I
don't see a display. Is there any way to reset the xorg.conf file to
it's original state?

Thanks
Dan