How to reset system management controller (SMC) on a Mac
Overview:
This guide will show you how you can reset SMC on your Macbook Pro/Air if there’s an issue with the battery, power, fan, USB port etc.
Prerequisites:
Outline of the process steps:
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Shutdown your Mac
Shutdown your computer and wait until your laptop is completely turned off.
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On your build-in keyboard, please hold these three keys.
Control on the left side of the keyboard
Option (Alt) on the left side of the keyboard
Shift on the right side of the keyboard
While you are holding these three keys, press and hold the power button for 10 seconds
Please release all the keys from the keyboard and wait for another 5-10 seconds