Ok, I'm obviously not an expert. I changed my display type in FC7 to a setting incompatible with my display and I get "signal out of range". How the heck can I boot to a command prompt or something to fix it? Or boot with a generic display driver? Thanks in advance!

Reboot. When GRUB starts, don't wait for it to time-out... Hit the space bar. Now, choose the first entry and hit the E key to edit it. Select and edit the line starting with "kernel". At the very end, and a " 3". Hit enter to finish editing, and B to boot. (I'm writing all this from memory and it's been awhile, so read the instructions as they appear.)

This should boot you into the command-line. From there, you can re-configure your /etc/X11/xorg.conf file. There's prob'ly a xorg.conf~ or something similar right next to it, which would have been your previous conf file.

Another way: Boot to your "signal out of range" screen.
<CTRL><ALT><F1> will take you to a text login screen. Login as root. Fix up your xorg.conf file. As Ranger Nemo said, you may have a backup of the old one. exit to logout.
<CTRL><ALT><F7> to go back to the "signal out of range" screen.
<CTRL><ALT><Backspace> to re-start the X server with the corrected xorg.conf
You should be fixed.