The SMC is responsible for managing power on your Mac. Resetting it can resolve certain uncommon issues related to power or thermal management.
Laptop computer with the T2 chip
Before resetting the SMC, follow these steps:
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Shut down your Mac, if possible.
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Press and hold the power button for 10 seconds, then release the button.
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Every Mac has a power button. On laptop computers that have Touch ID, press and hold Touch ID.
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Wait a few seconds, then press the power button to turn on your Mac.
If the issue persists, reset the SMC:
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Shut down your Mac.
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On your built-in keyboard, press and hold all of the following keys. Your Mac might turn on.
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Control
on the left side of your keyboard -
Option (Alt)
on the left side of your keyboard -
Shift
on the right side of your keyboard
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Keep holding all three keys for 7 seconds, then press and hold the power button as well. If your Mac is on, it will turn off as you hold the keys.
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Keep holding all four keys for another 7 seconds, then release them.
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Wait a few seconds, then press the power button to turn on your Mac.
Desktop computer with the T2 chip
If your Mac isn't a laptop computer, follow these steps:
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Shut down your Mac, then unplug the power cord.
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Wait 15 seconds, then plug the power cord back in.
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Wait 5 seconds, then press the power button to turn on your Mac.