Mac NVRAM / PRAM Reset

Settings that can be stored in NVRAM include sound volume, display resolution, startup-disk selection, time zone, and recent kernel panic information. If you experience issues related to these settings or others, resetting NVRAM might help.

Option key plus Command key plus P key plus R key

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.

  • On Mac computers that play a startup sound, you can release the keys after the second startup sound.
  • On Mac computers that have the Apple T2 Security Chip, you can release the keys after the Apple logo appears and disappears for the second time.




Keywords:cvtc nvram pram reset MacBook Mac resolution startup   Doc ID:106682
Owner:Bryan W.Group:Chippewa Valley Technical College
Created:2020-10-16 09:47 CSTUpdated:2020-10-16 10:32 CST
Sites:Chippewa Valley Technical College
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