Restarting Your Mac's NVRAM: A Step-by-Step Guide 'restart nvram'

If you're experiencing issues with powering on your computer, sleep, wake, or charging your Mac notebook battery, or other power-related symptoms, resetting the System Management Controller (SMC) might be the solution. However, if these issues persist, it's possible that you need to reset the NVRAM instead.

Resetting NVRAM is similar to resetting PRAM on older Mac computers. It clears certain settings stored in a small amount of your computer's memory called 'non-volatile random-access memory' or NVRAM. This location stores information that OS X can access quickly, including settings related to power management, display resolution, and time zone.

To reset the NVRAM on Intel-based Macs, follow these steps:

1. Press and hold the Power button until your computer shuts down.

2. Locate the following keys on your keyboard: Command (⌘), Option, P, and R.

3. Immediately after you hear the startup sound for a second time, press and hold these keys together: ⌘ + ⌥ + P + R.

4. Hold these keys until your computer restarts again.

After resetting NVRAM, you may need to reconfigure settings for speaker volume, screen resolution, startup disk selection, and time zone information. You may also need to reset NVRAM in the boot picker as well.

Note that Thinkpad laptops are known to be semi-bricked after an NVRAM reset using OpenCore, so it's recommended to update the BIOS on these machines instead of resetting NVRAM.

Resetting NVRAM can be a helpful step in diagnosing various system-related problems. If you experience issues related to power management, sleep, or wake, you might need to reset the NVRAM on your computer.

Before attempting to reset the NVRAM, make sure that you've tried other troubleshooting steps first. If these issues continue, it's possible that there is a hardware problem with your Mac's logic board battery. In this case, taking your Mac to an Apple Store or Apple Authorized Service Provider may be necessary to replace the battery.

By following these simple steps, you can reset NVRAM and potentially resolve various system-related problems on your Mac.

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