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I had to make a separate guide for this Mac as this Mac has the new T2 chip and requires a different procedure then the other Mac Desktops.

  1. How to reset the SMC, PRAM and NVRAM on an iMac Pro, SMC reset Part 1: step 1, image 1 of 1
    • Choose Apple menu > Shut Down.

    • After your Mac shuts down, press and hold its power button for 10 seconds.

    • Release the power button, then wait a few seconds.

    • Press the power button again to turn on your Mac.

    • If that did not solve the issue, move on to Step 2

  2. How to reset the SMC, PRAM and NVRAM on an iMac Pro, SMC Reset Part 2: step 2, image 1 of 1
    • Choose Apple menu > Shut Down.

    • After your Mac shuts down, unplug the power cord.

    • Wait 15 seconds.

    • Plug the power cord back in.

    • Wait 5 seconds, then press the power button again to turn on your Mac.

  3. How to reset the SMC, PRAM and NVRAM on an iMac Pro, PRAM and NVRAM reset: step 3, image 1 of 1
    • 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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If you have tried all of these resets and still have problems, head on over to our Answers Forum!

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24 628 crwdns2915208:0crwdne2915208:0

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one of my thunderbolt ports stopped working. I used the SMC and PRAM reset and they all worked afterwards. thanks!

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