I was playing around the Apple hot keys attempting find a hot key for a user who's macbook screen went out and has to use an external monitor. I'm not sure which hot key did the trick because I tried a bunch, but what happens now every time I hook up an external monitor both my macbook and the external monitor go into extension and are mired pictures. So typically when you hook up a monitor and it is extension it does not have any icons or the bar up top well both the monitor and my macbook are showing this. Any ideas on how to fix? I tried opening monitor preferences before plugging in the external but when I do that I can only access the external preferences not the normal preferences.