You will have to reconfigure some hardware settings once it successfully starts up, but it is a small price to pay for getting your laptop working again. If an SMC error was causing the MacBook Pro not to boot, it should now boot normally.
Then, press the pow er button to boot your laptop. Let go of all keys and reconnect the charger. Hold down Shift + Control + Option and the power button for ten seconds. Unplug the laptop from the charger and peripherals. If you have gotten this far without a successful boot, try resetting the SMC on your MacBook Pro. Resetting the SMC is usually left until last as it resets many settings back to their defaults. 
It manages all the low-level functions of the Macbook Pro, such as the power button, display, battery, fans, motion sensing, keyboard, indicator lights, and other similar elements. The SMC is the System Management Controller. If not, the MacBook Pro will still fail to start, and you’ll need to keep reading. If you’re fortunate, it will boot successfully.
Once you have held down the power button and released it, leave it off for a few seconds and then press it again to start the MacBook Pro as usual. This action cuts all power to the laptop and is the equivalent of removing the battery. All you need to do is plug your MacBook into its charger and hold down the power button for a minimum of ten seconds. If nothing happens, try a different wall socket or check the one you’re using with another device. Plug your MacBook Pro charger into the laptop and the wall socket. If not, continue reading there may be other issues. 
If Recovery Mode was successful, reboot your MacBook, and it should start normally. If this action works, you should see the macOS utility screen.
To boot into Recovery Mode, press the Command + R keyboard combination. If you hear noises and receive feedback while performing actions, but the screen is black, you can try to boot the MacBook into Recovery Mode to repair any issues it’s having. If you hear nothing, you need to troubleshoot further. 
Turn off the laptop, remove all attached peripherals, and turn it on again while listening carefully.ĭo you hear any whirring? Any beeps? Fan noises? If you hear something but see nothing, it may be the screen, not the laptop. If the brightness does not affect the black screen, move on. Although most laptops won’t go black with this setting, it still needs to be confirmed. One is to darken the display, and the other is to brighten it.
There are two keys along the top of the keyboard with sun icons on them.
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