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SMC Reset Older Laptops with Nonremovable Batteries

These models are included...
All MacBook Air models.
MacBook and MacBook Pro models after mid-2009, except the 13-inch mid-2009 MacBook.

Shut down the Mac.
Press and hold these keys: left shift, left control, left option keys.
While pressing these, also press the power button for 10 seconds.
Release all the keys.
Press the power button to start.

Note 1: This only works using the internal keybiard.
Note 2: Don't use for Macs with the Apple T2 security from 2018.