Display settings upside down?
iMac, OS X Mountain Lion, 24 inch, Early 2009
Funny!
There's a hidden setting for screen rotation - I doubt it has anything to do with this but you could try taking a look. To get at it, make sure System Preferences is not open, close it if it is. Open System Preferences. Now, while holding down the command and option keys, click "Displays" (this only works the first time, so if you mess up close System Preferences and start over from the beginning). You should see an additional "Rotation" option, if you set it to 180° your whole screen will flip upside down (do nothing for 15 seconds and it will automatically revert, or you could try to move your mouse to click "Revert" but it's a through-the-looking-glass experience).
Yes, I did see the additional rotation choices having followed your clues, but nothing changed after I chased down the 'revert' button with the screwy mouse action. Who knows what causes weird stuff to happen, it just does sometimes! Thanks for the laugh!
Robb
Doing that solved my issue. It just turned right side up. Not sure if it just did it on its own.
Display settings upside down?