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

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PRAM/NVRAM Reset

Shut down the computer
Press the Power button
Before the grey color screen is shown, press and hold Command + Option + P + R keys simultaneously.
Hold down these keys until the MacBook restarts and then you will hear the startup sound.
Release the keys.
Once you have reset PRAM/NVRAM, keep in mind that settings like disk caches, volume, time, keyboard and mouse preferences, will also be reset.

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