We have a 2 screen system, and it now only brings up the 2nd (blank) screen, even if only 1 screen is plugged in. What's going on and how do we fix it?

previously when it only brought up one screen, it would bring up the working desktop. Now it's just bringing up the extra or blank screen. Prior to this, powering down and unplugging for a few minutes and/or unplugging one monitor helped.
I was able to got to the area on the screen that wasn't showing and click on an icon. It started opening on the extra screen, but just hung. Using the keyboard to bring up the force quit menu only shows Finder running

Control-Eject gets you this familiar dialog box:
from there, the letter S gets you sleep. Any key after that wakes it up.

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