Mac Reset NVRAM: Step-by-Step Reset Guide

To reset NVRAM on an Intel-based Mac, restart it and immediately hold Option-Command-P-R for about 20 seconds. Macs with Apple silicon do not use the NVRAM reset key combination; restart the Mac and use the troubleshooting steps for the affected setting instead.

What does NVRAM do, and when should you reset it?

NVRAM, or nonvolatile random-access memory, is a small amount of memory that keeps certain hardware and startup settings available while a Mac is turned off. PRAM, or parameter RAM, is an older name for similar settings memory.

The stored details can include sound volume, display resolution, startup-disk selection, and time-zone information. A Mac NVRAM reset may help when one of these settings behaves unexpectedly, changes by itself, or does not remain selected after a restart.

Consider resetting NVRAM on an Intel Mac if you notice:

• The wrong startup disk is selected or a question-mark folder appears briefly before startup.
• Speaker volume or another sound setting behaves unexpectedly.
• Display resolution or related display behavior is incorrect after a normal restart.
• The Mac reports a time-zone problem that returns after you correct it.

A flashing question-mark folder that remains on the screen usually needs startup-disk troubleshooting, not repeated NVRAM resets.

What should you do before resetting Mac NVRAM?

Save your work and close open apps because the Mac must restart. Write down any custom startup-disk, sound, or display settings that you may need to restore afterward.

First, restart the Mac normally and test the setting again. Check cables and power for an affected external display or audio device. If the problem began after connecting an accessory, disconnect nonessential devices and restart before attempting a reset.

Confirm whether the Mac has Apple silicon or an Intel processor. Open the Apple menu and select About This Mac; the window identifies either a chip, such as an Apple M-series chip, or an Intel processor.

A reset Mac NVRAM procedure does not erase documents, apps, user accounts, passwords, or the operating system. It also does not repair a damaged startup disk, remove incompatible software, or correct a failed accessory.

How do you reset NVRAM on an Apple silicon Mac?

Apple does not provide the classic Option-Command-P-R reset procedure for Macs with Apple silicon. That startup combination is for Intel-based Macs only, so holding it on an Apple silicon Mac is not the correct way to perform a Mac reset NVRAM procedure.

For a current Mac with Apple silicon:

1. Save your work and open the Apple menu.
2. Select Restart.
3. Allow the Mac to start normally, then test the affected sound, display, time-zone, or startup-disk setting.
4. If a startup problem remains, shut down the Mac. Press and hold the power button until Loading startup options appears, then select Options to use macOS Recovery.

There is no second startup sound or other user-facing signal confirming a separate NVRAM reset on Apple silicon. Do not use Terminal commands from an unverified guide to imitate the Intel procedure.

How do you reset NVRAM on an Intel Mac?

The Intel Mac NVRAM reset uses four keys held together during startup. Use the built-in keyboard or a wired Mac keyboard when possible; a wireless keyboard may not be recognized early enough in startup.

1. Save your work and shut down the Mac.
2. Press the power button, then immediately press and hold Option, Command, P, and R together.
3. Keep holding all four keys for about 20 seconds. The Mac may appear to restart during this time.
4. Release the keys and allow the Mac to finish starting.
5. Sign in and test the setting that caused the problem.

On an older Mac that plays a startup sound, you may hear that sound more than once. On a Mac with the Apple T2 Security Chip, the Apple logo may appear and disappear more than once. Some Macs provide no obvious signal, so completing the approximately 20-second hold is the practical confirmation.

If the key combination does not work, shut down and try again. Make sure all four keys are held together. A firmware password can prevent some startup key combinations from working, and a Mac set to start in Windows through Boot Camp should be set to start from macOS first.

What happens after a Mac NVRAM reset?

After an Intel Mac NVRAM reset, macOS starts normally, but some stored choices may return to their defaults. Your personal files and installed apps remain in place.

Check and reconfigure these items if necessary:

• Startup disk selection.
• Speaker volume and sound output.
• Display resolution and other display choices.
• Time zone and clock settings.

Open System Settings and review only the setting connected to the original problem. If the Mac now starts from the wrong disk, select the intended disk in Startup Disk settings and restart.

What should you do if resetting NVRAM does not fix the Mac?

If resetting NVRAM does not help, stop repeating the reset and troubleshoot the exact symptom. Disconnect nonessential accessories, restart in safe mode, or use Apple Diagnostics when a hardware problem is suspected.

For a question-mark folder, blank startup screen, or a Mac that cannot finish starting, use macOS Recovery and run Disk Utility to examine the startup disk. Reinstalling macOS is a later recovery step and should not be treated as part of an NVRAM reset.

If the problem continues, open {site} and search Apple Support for the exact screen symbol or symptom. Contact Apple Support if the Mac cannot start, Recovery is unavailable, or Apple Diagnostics reports a hardware issue.