Hold the Shift key while pressing the Power key, then let go of the Shift key when the Apple logo appears. When the system has started, click the Restart button, then see if the black display has disappeared.

You can try to manually change the brightness of the screen. You can do this by holding down the brightness key on your MacBook's top panel. Make sure that the MacBook is powered on. If it is, the screen will remain black. If the computer is still sleeping, you can press the Return key to turn it back on. This should fix the black screen issue. 

Once the system has fully recovered from the Sleep Mode, you can continue with troubleshooting the problem.

The first step to fixing the black screen on a MacBook is to restart the computer. It is possible that the problem is related to the battery of the Mac. Replace it if necessary. Alternatively, if the battery is the culprit, the next step would be to remove the battery. During this process, your Mac should reboot. You should then see if this fixed the problem. The next step is to try to reset the computer's SMC.

A simple way to restore the brightness is to restart the computer. If your Mac has been in sleep mode, this might be causing the black screen. Try typing the first letter of the user name and then press the return key. The screen should return to normal after this procedure. If this does not work, try to enter the password to your MacBook Pro and press the Return key. This should clear the black screen. If not, try a different method, such as using the F1 or F2 buttons.

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Pressing the power button while holding the F1 and F2 keys will force the Mac to restart. After the reboot, it should be able to boot up in normal mode. Sometimes the screen brightness is accidentally reduced to zero. This will cause a black screen. In order to resolve the problem, you can use the F1 and F2 keys. The keys are often located on the keyboard. If they do not, try pressing the Power button again.

If the problem is caused by hardware, a Mac user may try to hold the Power button for a few seconds. This will force the Mac to restart in safe mode. It will also restart the screen if it is in sleep mode. This option will not work for a MacBook Pro that is in sleep mode. Nevertheless, the method above is worth trying. The power button should be held for at least six seconds to solve the problem.

If the problem is not resolved, a second option is to restart the Mac. The first and last option is to connect the power to the Mac. Then, you should release all the buttons to put the machine into sleep. Then, you should try the second method. You can also perform the same procedure to reset the macOS. The key combination "Power Off" and "Restart" will cause the Mac to reboot.

If the problem isn't fixed by these methods, then it might be a corrupt startup disk. For this option, it is necessary to force the Mac to run diagnostics in safe mode. To do this, you should hold down the power button for six seconds, then release the key. After the system has completed the diagnostics, the screen should be back to normal. The second method is to reboot the MacBook.

The first solution is to restart the Mac. The Mac might be in sleep mode. When this happens, it's important to remember the password. This password will allow you to unlock the MacBook. If you can't find the password, you can also try the second option. If you don't have a password, you can simply type the first letter of your user name in the lock field. Then press the return key. If the problem still persists, you should try the third solution.