You should also completely power off the external monitor and disconnect your Mac from it. Upon reboot, macOS will ask for authentication (Touch ID won’t work here, enter Mac password). Sometimes a simple trick such as rebooting the Mac can fix the device not detecting the display issue.Ĭlick on the Apple icon in the menu bar and select Restart. Select the right HDMI port on the monitor and check the Mac output. Use the remote (if it comes with a monitor like Samsung M7) or use the on-device buttons to change the HDMI selection. You may have connected the cable to the first port and used HDMI 2 as the output screen. Most modern monitors come with multiple HDMI ports to use. While you are at it, do take a close look at the external display’s HDMI ports too. You can use compressed air to clean out the dusty ports. You should clean mini-Display port or Type-C port, depending on your Mac model. The Mac won’t detect the display even with the right high-quality cable. Remove Dust from PortsĮxposed ports on your Mac often attract dust particles and that might cause the cable port to not fit properly. Some cables are limited to 4K at 30fps only while your monitor can go up to 4K at 60fps. You should also check the display resolution and FPS the cable supports from the product page. That’s because cheap cables might overheat or may not be as per the standards. And here’s where things get interesting.įirst, you shouldn’t go with any random cable from the store or Amazon. Some might be using Type-C to HDMI cable to connect MacBook to a display. Make sure there isn’t any heavy wear and tear on either side. Closely inspect both the ends of the HDMI cable. If you are using new 2021 MacBook Pro models or pre-2016 MacBook models, chances are, you are trying to use HDMI to HDMI cable along with an HDMI to Type-C adapter to connect MacBook to a display. First of all, you should confirm if you’re using a correct HDMI cable with your external monitor.

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