Bergesch Computer Services, Inc.
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Any suggestions, recommendations or ideas found on this site are applied at your own risk.  This page contains our opinions based on years of cleaning up computers and assisting customers with various problems... 

Display suddenly changes (size)

For no apparent reason (surprisingly not an update breaking things), your display size/resolution changes and now shows only a few resolution settings, none that work properly with larger monitors.  You'll need to override the Available monitor list.  In Display:

changed adapter