Mac Pro mid-2010, AE CS4.
While making adjustments to the preference settings I stupidly changed the display to electronic cinema. Clicked OK and the screen went black. Tried holding down CMD/OPT/SHift on restart and had no luck. Spinning beach ball for several minutes before force quitting.
I have two Apple cinema displays, vintage 2006 that work very well. I would rather not uninstall and reinstall but will if no other suggestions offered.
Is there any other way to change the setting? Thank you.