Non-volatile random-access memory (NVRAM) is a small amount of memory where macOS stores all the settings it needs to access quickly, including some settings related to the display. Resetting NVRAM: Wipe Your Non-Volatile RAM Select “Detect Displays” to see whether macOS recognizes the attached display.ġ2. Press and hold the Option key, and a “Detect Displays” button should appear.Navigate to “System Preferences -> Displays.”.If macOS doesn’t recognize your external display automatically, you can try to force the connection using macOS’s Detect Displays feature: Use macOS’s Hidden Detect Displays Feature New versions of macOS sometimes include driver updates, so you should also check that you’re running the latest version of macOS. If you’re using a third-party graphics card, check that the card is seated fully in the Peripheral Component Interconnect (PCI) slot and that you have the very latest version of all the necessary drivers. If yes, then this strongly indicates that the problem lies with your external monitor. If your monitor is buggy, temperamental, or outright broken, then no amount of adjusting your Mac’s settings is going to fix the problem! If you have access to a second external display, try attaching it to your Mac to see if it works. You should check that you’re running the most recent version of macOS. If your operating system is out of date, then you may be encountering an issue that’s already been addressed in a recent update. Check Whether Your Operating System Is Up to Date Try attaching your MacBook to a power outlet to see whether this gives your laptop the juice it needs to power an external monitor. If you’re running your MacBook from its internal battery, it may not have enough power to push pixels to an external monitor. If you’re experiencing issues with an external display, then it’s always worth detaching your cable and adapter, then re-attaching them firmly. Even a slightly loose connection can prevent your Mac from recognizing the attached display. Just because a cable looks connected doesn’t mean that it is connected securely. Click “Restart,” then immediately close your Mac’s lid.Select the “Apple” logo in your Mac’s menu bar.
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