reset the System Management Controller on Mac
1.Plug in the power adapter if it’s not already connected.
2.On the built-in keyboard, press the (left side) Shift-Control-Option keys and the power button at the same time.
3.Release all the keys and the power button at the same time.
4.Press the power button to turn on the computer. The LED on the power adapter change states when you doing the reset.
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