monitor panic!

[Reginald Wilders]

Dear mailinglist,

After succesfully installing YDL 4.1 on an Mac G4, I changed the monitor settings.
And during the reboot the monitor displays the following message:

Out of range signal.
Cannot display this video mode,
change computer display input to 1680 x 1050 @ 60 Hz

I clearly selected the wrong settings! How can I undo this? 
Or, how can I interrupt the booting process, and edit the monitor-setting file?
(if that is the way to correct this problem...)

Thanks!
Reginald Wilders

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