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Restart your Mac with the external monitor connectedĪs always, it’s a good idea to restart your Mac when something stops working, including your external monitor. If this helps, it means there’s a problem with the accessory you were using.įinally, make sure both your Mac and external display is connected to power. Try connecting your external monitor to your Mac directly instead. Use a different cable to connect your monitor.Īvoid using extension leads, hubs, or adapters. You should also try connecting it with a different cable if you have any spares lying around. Alternatively, connect to a different input on the display, provided there is more than one input available. If your external monitor still isn’t working after you reconnect it, try using a different port on your Mac. #DETECT DISPLAYS MAC FULL#Before reconnecting, inspect the ports and the cables for signs of damage you might need to clean your port if it’s full of dirt. Reconnect all the cables and use a different portĭisconnect the cables connecting your Mac to your external monitor. ![]() The same goes for Thunderbolt 1 or 2 and MiniDisplay ports on older Macs. If your monitor needs a Thunderbolt connection, you need to connect it to a Thunderbolt port. It’s important to know that Thunderbolt 3 ports and USB-C ports are not the same, even though they look identical from the outside. View the About This Mac window to find details about your computer. Click the System Report button for more information about the ports on your Mac. Then go to Apple > About This Mac to make sure your Mac meets them. Visit the manufacturer’s website for your external monitor to check its compatibility requirements. #DETECT DISPLAYS MAC SOFTWARE#Even if you use an adapter to connect both devices together, they still need to run compatible software for every feature to work. ![]() ![]() Unfortunately, not every external monitor is compatible with every Mac. Check the compatibility of your external monitor You should also check for updates to any hubs, extenders, or adapters you’re using. Check for new software updates to your Mac.įinally, visit the manufacturer’s website for your external monitor or display cable to check if there are other firmware updates to install. #DETECT DISPLAYS MAC INSTALL#Then open the App Store and click Updates in the sidebar to install app and firmware updates. #DETECT DISPLAYS MAC UPDATE#Open the Apple menu and go to System Preferences > Software Update to update macOS. If your external monitor isn’t working in any way, the first thing to do is make sure everything is updated. There’s your operating software (macOS), the particular app you’re using, and firmware built into the monitor, Mac, or even cables. Various pieces of software are involved in making an external monitor work with your Mac. If your Mac’s external monitor isn’t working but you can’t find the exact problem above, you still might be able to fix it with the tips below. This list isn’t exhaustive, but it covers the most common external monitor problems.
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