How to reset the SMC, PRAM and NVRAM on a Mac Laptop

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SMC Reset for Mac Laptops with a Non-Removable Battery

If your Mac has a removable battery, skip this step and go to step 2.
Choose Apple menu > Shut Down.
After your Mac shuts down, press Shift-Control-Option on the left side of the built-in keyboard, then press the power button at the same time. Hold these keys and the power button for 10 seconds. If you have a MacBook Pro with Touch ID, the Touch ID button is also the power button.
Release all keys. Press the power button again to turn on your Mac.

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