Resetting screen modes (prefs) on AmigaOS

[Oldsmobile_Mike]

Selecting a screenmode that your monitor can't display  and then saving it (instead of "testing" or "using" it) is a common  problem on Amiga's.  It goes back for as far as there have been Amiga's  and is not some new problem specifically related to the Indivision.

Here's a 3-minute YouTube video I made last year that shows how to fix it:

https://www.youtube.com/watch?v=RSzJn9BRHIE