You must have an LCD monitor?
Well, you can boot into safe mode. which should avoid loading the ATI Catalyst drivers and allow you to at least see the screen. Once in the OS you can eliminate the drivers and reboot. That should put you at square one again where you can reinstall the drivers and begin again.
Another option would be to round up a CRT display. These are multisync and are forgiving as far as refresh rate and resolution are concerned. Once you can see the OS with the CRT display then you can make any adjustments you'd like to see if they will work on your LCD.
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