Frequently Asked Question

Reset MAC system settings (NVRAM and SMC)
Last Updated 5 months ago

Resetting NVRAM

  1. Shut down your Mac.
  2. Locate the following keys on the keyboard: Command (⌘), Option, P, and R.
  3. Turn on your Mac.
  4. Press and hold the Command-Option-P-R keys immediately after you hear the startup sound.
  5. Hold these keys until the computer restarts and you hear the startup sound for a second time.
  6. Release the keys.
After resetting NVRAM, you may need to reconfigure settings for speaker volume, screen resolution, startup disk selection, and time zone information.Power related settings can be controlled by the System Management Controller (SMC) on your Mac. If you are experiencing issues with powering on your computer, sleep, wake, charging your Mac notebook battery, or other power-related symptoms, you might need to reset the SMC instead.

For more details and how to reset the System Management Controller (SMC), visit Apple’s NVRAM Reset Support Page.

You've cleared your NVRAM. What Next?

After you’re done clearing your NVRAM, you might find your hard drive is giving you trouble. Maybe your Mac is still booting from the wrong hard drive. So if your hard drive fails, what happens to your data?

To protect your data, make sure your hard drives are:

To get more data protection strategies, visit

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