first, press the ALT-key on your keyboard and a button marked “Detect Displays” appears where the “Gather Windows”-button used to be click on it when it appears.select the Display Preference window that has 3 tabs on it marked “Display”, “Arrangement” and “Color” (not the window that has “Display” and “Color” only).then you will see 2 Display Preference windows on your MacBook screen.if there is a “Gather Windows” button, click on it.If this works, you’re good, if not, try Remedy #5 if there is no “Gather Windows” button, press the ALT-key on your keyboard and a button marked “Detect Displays” appears click on it when it appears.in the Display Preferences window, see if there is a button marked “Gather Windows” bottom right.in the System Preferences window, select “Displays”.on your MacBook, open Apple –> System Preferences. If this works, you’re good, if not, try Remedy #4 reconnect all cables and double-check if they’re properly connected on both the Mac and the monitor.
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