what happens if you unplug the tv from the mac![]()
if you plug the tv back in what happens![]()
you could set the imac's screenn to primary then sort out the tv's settings then set the tv to the primary screen again
Reinstall OSX?
Go to system preferences and change the setting:
1. Press Command + F1 to enable menu selecting
2. Press Control + F2 to go to menu
3. Press the down arrow key on the keyboard 5 times
4. Press enter, it will open System Preferences
5. Click on display and change setting