Your problem is probably refresh rates, not your resolution.
Gather the documentation for your monitor and video card. Specifically, you'll need to know supported resolutions and refresh rates, as well as how much video memory you have.
Boot your system and login blind.
<ctrl>+<alt>+F1 to get to a virtual terminal. You should now be able to see a prompt on your screen.
Login and run xorgconfig.
This should take care of your problem, let me know if it doesn't.
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