How to Fix External Monitor Not Working on Mac | Second Display Not Working

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📌Timestamp
00:00 Intro
00:29 Method 1: Restart your Mac with the External Monitor Connected
00:52 Method 2: Check the External Monitor Connection
01:08 Method 3: Check Your Cables Connection
01:32 Method 4: Update macOS to Latest Version
02:00 Method 5: Remove all Connected Adapters
02:19 Method 6: Check Your Mac Display Settings
02:42 Method 7: Reset NVRAM
03:13 Method 8: Use an Alternative Monitor to Test
03:33 Bonus: How to Recover Lost/Deleted/Damaged/Corrupted Data from Mac devices?

Hooking up Macbook to an external display either to allow us to work from a larger screen and use the Mac in clamshell mode or to have a second monitor. Most of the time, it just works, but what do you do when your Mac is not recognizing an external monitor? Here is how to troubleshoot external display not working on Mac.

Method 1: Restart your Mac with the External Monitor Connected
A reboot is one of the oldest troubleshooting methods that can resolve a myriad of connectivity issues, including external monitor detection problems. If restarting doesn’t work, you could try putting your MacBook to sleep. To do so, click on the Apple logo and select Sleep. Then wait for a minute or two before waking up your MacBook.

Method 2: Check the External Monitor Connection
Make sure that external monitor is securely connected and is plugged into compatible ports (such as HDMI or Mini DisplayPort). And the most important, the external monitor is connected to power.

Method 3: Check Your Cables Connection
Make sure that both ends of the cord connecting the two devices are securely plugged in. If the connection seems okay, but your MacBook still can’t detect the external display, you may try switching the connection ports.

Method 4: Update macOS to Latest Version
Updating your computer’s software and firmware can be a great way to solve many display issues that crop up on MacBooks. Connect your computer to the internet. Click the Apple logo in the upper left corner of your screen.Select Software Updates and update to the latest version.

Method 5: Remove all Connected Adapters
Incompatiable adapters, third-party hubs may result connection issues. So remove connected adapters and try again.

Method 6: Check Your Mac Display Settings
If you’re having problems connecting an external monitor to your MacBook, one possibility is that your display settings aren’t configured correctly. To be specific, an external monitor may not work if your Mac’s brightness and resolution settings aren’t right. Click on your Apple logo and select System Preferences. Go to Display and adjust settings.

Method 7: Reset NVRAM
NVRAM (Non-Volatile Random Access Memory), is where stores system settings and preferences. It may occasionally need to be reset to resolve issues related to resolution changes.

Method 8: Use an Alternative Monitor to Test
To find out if your monitor is faulty, disconnect it and then connect a second external display. If the second monitor works just fine, it means the first one is either broken or incompatible with your MacBook. It it's faulty, you’ll have to get yourself a new monitor.

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