After a faulty "driver" change in the "/etc/X11/xorg.conf" file, I also got a blank "out of range" screen.
After a reboot, linux tried to start X, but showed the "out of range" message. tried again, got "out of range" and so on and so forth, until (after about 2 minutes) I got a message that X-server couldn't be started (duh...
), and that linux will try to start X with a fresh config.
After that, it worked. (and even let me choose the "driver" to be used out of a list).
I'm using Fedora Core 6... it might be a rescue procedure that exists only on FC6?