Troubleshoot Mac External Display Not Working Issue

While you are going to extend your screen area to a larger screen, external displays play an important role as it helps in expanding the screen.

Seldom some issues might occur with the external display. Mac external display not working is one of the most common problems that annoy the users. In such instances, the picture quality becomes blurry due to the poor resolution. The brightness and contrast are some factors that are responsible for this issue.

In case if you are also going through the same problem, then follow the solutions stated here. These solutions will help you to fix the faulty external Mac display easily. But before that, take a look at the causes responsible for the not working of Mac external display.

What Causes Mac Not Detecting Display?

There are a few reasons which seem to be the main culprits for this problem. Here we have listed some of them. Hence, have a deep look at the reasons and avoid the problem.

By any chance, if the HDMI connections have any fault, then it might lead to the same problem. 

Moreover, if the USB cables have any damage or any loose connection, then it might create the same problem as well. Even due to high resolution, the external display might stop working.

How to Get Rid of Mac External Display Not Working?

Here, we are going to discuss some amazing methods that are helpful for you to solve the problem on your own. You can try them one by one and fix this troublesome issue without any delay.

Adjust the Screen Resolution

This is the first solution through which you have to change the resolution and then check if the solution works for you or not. For setting the resolution manually, you have to open the System Preference tab by clicking on it.

After that, navigate to the Display section and press the Option key for a few seconds. Once the Scaled icon is selected, release the Option key and you will get to see a list of resolution in the resultant page.

Now, select a resolution range and then check if the problem has resolved or still showing up.

Set Color Accuracy

If the first method is not helpful for you, then you have to fix color accuracy by following the methods stated here.

To do so, at first, launch System Preferences option by clicking on it. After that, find the Displays tab and click on it. Now, it’s time to tap on the Color tab.

Then, move to choose the Calibrate icon and start the calibration process. Follow the instructions that are showing on the screen. Finally, check if the solution is workable for you or not.


If you are still facing Mac external display not working issue, then reset the NVRAM and check if the solution works for you or not.

To do so, at first, turn off your Mac by pressing the Power button for a few seconds. After that, press down the P, R, Option and Command button at the same time on your keyboard.

Once you hear the startup sound two times, you should release all the buttons as well. Hopefully, Mac will restart automatically and check if the solution is beneficial for you or not.

Check the Peripherals

In case you are using Mac in Closed Display Mode, then you should attach an external mouse and keyboard with the computer.

So, if you are using USB peripherals, then, first of all, you need to check all of them. If you find a damaged one, then replace them with a new one and check if the problem still shows up or get solved.

Update Software and Firmware

The “Mac not detecting display” can be solved by upgrading the software and firmware. For updating software, at first, you have to check that your Mac device is connected to a strong internet.

If you are connected with a week or unstable internet connection, then it might restrict you from updating the software completely. Hence, navigate to the Apple logo and click on it. You will find this option at the top left corner of the screen.

After that, select Software Update by clicking on it. Here, you can find compatible updates. Install and download them one by one.

Once the installation is completed, follow the prompts that are displayed on the screen. Finally, restart your Mac and check if the solution is helpful for you or not.

Check the Setup and Configuration

Checking the configuration setup is another way to get rid of this particular problem. Hence, you need to be sure that your Mac is connected to an electrical outlet.

If your device is running on battery, then check if the battery is working properly or not.

Summing Up

If the same problem still occurs, then we advise you to talk to an expert and get the most effective hacks regarding your problem.

But we are sure enough that you can completely eliminate the problem if you go through the above article thoroughly.

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