This isn't official from Apple, but years of MacBook lore claim that a particular key sequence can sometimes revive a non-reacting blank MacBook Pro screen. Press power button once, Press, and then hold the power button to perform a hard shut down. Wait 15 seconds and press the button to restart. We have no idea why this works, but plenty of people have vouched for it.MacBook Pro Safe Mode allows you to start you MacBook without other launch agents booting up.
To boot into Safe Mode, power off and let your MacBook Pro sit for 20 seconds. Turn it on again and immediately hold down thekey. Release the Shift key when the login window appears. You should see 'Safe Boot' in the upper right corner of the window. Sometimes you may be asked to login twice, and your computer may take a longer than usual to start while it carries out diagnostics.
Note that you may lose some of your settings by doing this, so if this does solve the issue, check you system preferences afterwards to make sure your date/time, display and disk options are correct.The Mac's Systems Management Controller controls things like temperature, keyboard, display and fans. Resetting the SMC is another possible quick fix to resolve a black screen on MacBook Pro. Turn of your MacBook and unplug it for at least 15 seconds before plugging in again.
The black screen on a MacBook Pro external monitor may be caused by simply closing your laptop. By default, this automatically puts your MacBook Pro to sleep. If you want to be able to close the lid of your MacBook Pro but still use the laptop via an external monitor, you'll need to change some settings. Go to System Preferences > Battery > Energy Saver > Power Adapter, and move the slider to Never.
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