How to reset the SMC, PRAM and NVRAM on an iMac Pro

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PRAM and NVRAM reset

Shut down your Mac.
Then turn it on and immediately press and hold these four keys together: Option, Command, P, and R.
You can release the keys after about 20 seconds, during which your Mac might appear to restart.
You can release the keys after the Apple logo appears and disappears for the second time.
You must have a wired keyboard made by Apple in order for this to work.
You can buy one from Amazon here.

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