How to restore proper display prefs

I was testing different display resolutions using the prefs panel. One setting that does not work with the monitor has "stuck" and now the monitor complains with "input not supported". I don't recall pressing Enter to accept the setting, but the behavior suggests otherwise.
The machine is a G4 silver tower running 10.4.8. The monitor is an Envision 17", not a CRT, I think it is LCD.
On boot, the chime is normal, the monitor displays the apple logo, and the little bars moving in a circle. After a few seconds, the monitor blanks out and displays the error message.
I tried resetting PRAM but that did not make a difference.
Suggestions are most welcome

Yes, of course. First time through, the settings didn't seem to take, hence my question. I tried a second safe mode boot and upon normal restart, the display settings were correct.
Many thanks.

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