lösche folgende Dateien…
falls vorhanden
/Library/Preferences/com.apple.windowserver.plist
~/Library/Preferences/com.apple.windowserver.plist
~/Library/Preferences/ByHost/com.apple.windowserver.<Hardware-UUID>.plist
Danach Neustart
/Library/Preferences/com.apple.windowserver.plist
~/Library/Preferences/com.apple.windowserver.plist
~/Library/Preferences/ByHost/com.apple.windowserver.<Hardware-UUID>.plist
Danach Neustart