Even a slightly loose connection can prevent your Mac from recognizing the attached display. Just because a cable looks connected doesn’t mean that it is connected securely. Click “Restart … ” and then immediately close your Mac’s lid.Select the “Apple” log in your Mac’s menu bar.Connect your Mac to the external monitor.Some users have also reported positive results by switching their monitor on and off while also removing and reattaching the cable:įinally, if you’re using a MacBook, you can try disconnecting while also closing your Mac: Disconnect your adapter for 10 seconds.Let’s start with the simplest fix: turn it off and then turn it back on again! There are a few different techniques that you can try:
