You can try to (from the command line) run 'xf86cfg -textmode' as the root user. This will bring you to the X config program, at which point you should set up your system as a pretty generic graphics card (svga at whatever resolution you're used to), which will work with any card. From there, you should be able to run gdm or kdm (gnome or kde, respectively) or startx, and use your gui again. Then, simply undo your mistake, and reset your video card to the proper type.
Your GUI config is /etc/X11/XFree86Config(-4). The -4 is sometimes optional, depending on the system. Simply copy your backup over it (with the 'cp' command as root), and you might fix the problem. On the other hand, if it's because you were updating a module, you might have to try the above solution, as the kernel module might be toast until you fix it, rendering it useless, unless that's got a backup as well, in which case you simply copy the old version over the new. As this is easier in a gui for many people, you'll probably prefer to use the above suggestion for anything more complicated than a simple copy. Also, you'll be able to use the GUI for popping in here to ask more questions, instead of dual booting or using another computer to do so.
Of course, <ctrl><alt><F1> will pop you out of a nonworking GUI into the command line, and <ctrl><alt><backspace> will unload a bad startx.
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