Force boot to universal video resolution?

I have a G4 running OS9 and it boots fine. It displays a video image until late in the boot sequence when the screen goes black. This condition occured after I chose a video resolution that the LCD display apparently does not support. It would seem that the G4 is remembering that setting and I can't change it because the screen is black. I have switched to another monitor where all is well, but the problem persists if I return to the problematic monitor.
Is there a way to force the Mac to boot at 640 x 480 or some other universal resolution?

Hi, iBob -
Try this sequence.
While booted using the monitor you can use, throw away these preference files - Display Preferences and Monitors Preferences (both can be found in Preferences in System Folder; the second is in a folder named Monitors Preferences in Preferences).
Empty the Trash, then immediately shut down.
Swap monitors.
Boot the machine - zap (reset) the PRAM on this startup. To do that, immediately upon booting press the Command-Option-P-R keys, keep them held down until you've heard three additional sets of startup chimes. Then release the keys and let startup resume.
This should result in the machine booting using the hardware default resolution, which is either 640x480 or 800x600 depending on model.
Once it has finished booting you should then be able to make any needed adjustments in the Monitors control panel.

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