Fedora 7: xorg.conf messued no screen need to revert it

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I have just installed Fedora on my Dual boot (WIndows XP + Ubuntu 8.04) and found the link below to fix my xorg.conf to display proper resultion and use my ATI.

http://forums.fedoraforum.org/showth...light=recovery

I did what was mentioned for F7 but when I rebooted, I lost all output to my monitor. All I have on my monitor is a monitor popup saying something like invalid frequency/hrtz used.

Since I am totally new to Fedora 7, how can I reboot and have a shell prompt to change my xorg.conf ? I tried to boot from the DVD with recovery but I do not understand how it works (besides it just copies my filesystem to somewhere else but without the xorg.conf).

All I want, is to be able to use my ATI card (see signature) and have 1280x768. I am not planning on using any special desktop effects.