Resetting your MacBook Pro is a way to fix a problem that cannot be resolved through other methods, such as restarting your computer or force quitting a program. You may need to reset your MacBook Pro if the laptop is operating unusually slowly; if the laptop does not respond as it should when the power button is pushed; or if the laptop shuts down on its own without being powered off.
Plug the MacBook Pro into a power source and shut down the laptop.
Press and hold "Shift," "Control," "Option" and the power button simultaneously. Release all buttons simultaneously.
Press power to turn on the computer.