If you have a chain of adapters, such as a Mini DisplayPort to DVI adapter chained to a DVI to HDMI adapter, consider replacing this setup with a single, compatible adapter. You can’t force a Mac to work properly with an incompatible external display by chaining multiple adapters together! Step 4: Wake your Mac by interacting with its trackpad, mouse or keyboard. Step 1: Click the “Apple” icon in your Mac’s menu bar. Similar to the “turn it off and back on again” technique, you may be able to fix Big Sur not recognizing external monitor issue by letting your Mac take a quick power nap: If your Mac is running an outdated version of operating system, then you may be encountering an issue that’s already been addressed in a recent update, so you should make sure that your device is running the very latest version of macOS. Try plugging your MacBook to a power source to see whether this gives your computer sufficient power to run an external monitor. If you’re running your MacBook from its internal battery, it may not have sufficient power to push pixels to an external monitor. If you’re experiencing Big Sur external display issue, then consider detaching your cable and adapter and then re-attaching them firmly. Even a slightly loose connection can prevent your Mac from recognizing the attached display. Simply because a cable looks connected doesn’t mean that it is connected properly. If you find Big Sur not recognizing external monitor still, check the next solution. Click “Restart … ” and then immediately close your Mac’s lid.Click on the “Apple” logo in your Mac’s menu bar.Build a connection between your Mac and the external monitor.Lastly, if you’re using a MacBook, you can try disconnecting while also closing your Mac: Some users have been able to resolve the issue by switching their monitor on and off while also detaching and reattaching the cable: Unplug your adapter for about ten seconds.Let’s begin with the easiest solution: power off your Mac and then power it back on! You can try a couple of different tricks: If external display stopped working after updating to Big Sur, then you can try the following fixes: Fix #1. How to fix external monitor not working on Big Sur issue Using an external display with your Mac should be as easy as connecting the cable, but what if external display stopped working after updating to Big Sur? In this troubleshooting guide we’ll share all the fixes, tricks and techniques you can try to fix the external monitor not working on Big Sur issue.

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