Monitor settings off, now I can't get in to Fedora
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You probably have a "failsafe" option when you boot. You can choose that and it will take you to a command-line console where you can enter, as root, "xorgconfig" and that program will prompt you for information about your monitor, video card, mouse, and keyboard. You should be able to get your monitor set back to a usable state that way, and later you can tweak the mouse and keyboard settings, which are apt not to be just the way you want them.
I'm hoping Fedora is similar to Mandrake in having a list of options for booting. (Windows has the same thing.) You would choose the one that says "failsafe" or "command line" or "minimal" or something along those lines. If that isn't an option, you can always use one of your distribution disks to boot, and it will give you a way to go to a command line with some basic functions available. Only it's doubtful that it would be easy to access anything on your system that way, since the files wouldn't be mounted yet.
If you have one of the "live CD" distributions such as Knoppix or one of many others, you could use that to do some maintenance. The live CD would auto-detect your monitor and apply usable settings so you could do your work with it.
I'm sorry I can't be more specific--I don't have a Fedora setup to experiment with. Hope this gives you some useful ideas, though.
I think you could use the Suse live disk to get in there and, as root, run xorgconfig on your Fedora system.
Another possibility: With Mandrake, you can re-install your setup as an "upgrade" and not lose any of the programs, libraries, etc. you've added since your original installation. If that same "upgrade" mode is available with your Fedora installation disks, you could do that and it would correct your monitor problem. It would be quicker to run xorgconfig, though....