How to Reset NVRAM (PRAM) on a Mac

To reset NVRAM on an Intel-based Mac, restart it and immediately hold Option-Command-P-R for about 20 seconds. A Mac with Apple silicon does not have a separate manual NVRAM reset procedure; macOS handles the relevant checks during startup.

NVRAM stands for nonvolatile random-access memory. PRAM, or parameter RAM, is an older name for memory that served a similar purpose, so instructions for an NVRAM reset and a PRAM reset usually refer to the same Intel Mac startup command.

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

NVRAM keeps a small set of system settings available even while the Mac is turned off. Depending on the Mac and its configuration, those settings can include speaker volume, display resolution, startup-disk selection, time zone, and recent kernel panic information.

An NVRAM reset may help when one of those settings behaves incorrectly or repeatedly changes. Common reasons to try it include:

• The startup sound or speaker volume is unexpectedly loud, quiet, or muted.
• The display starts at the wrong resolution or uses an unexpected configuration.
• The Mac tries to start from the wrong disk.
• The time zone remains wrong after you correct it.
• A question-mark icon briefly appears before the Mac finds its startup disk.

Resetting NVRAM does not erase documents, applications, photos, or user accounts. It is a focused troubleshooting step, not a factory reset or a macOS reinstallation.

What should you do before resetting NVRAM on a Mac?

Before performing an NVRAM reset on a Mac, save open documents and close applications. The procedure requires a restart, and unsaved work could be lost.

Write down any settings you may need to restore. Speaker volume, display resolution, time zone, and startup-disk selection can return to defaults or require confirmation after the reset.

Next, identify whether the Mac has an Intel processor or Apple silicon:

1. Open the Apple menu.
2. Select About This Mac.
3. Look for an entry labeled Chip or Processor.
4. If the entry says Apple followed by a chip name, use the Apple silicon guidance below. If it identifies an Intel processor, use the Intel steps.

If the Mac cannot reach the desktop, its original packaging or verified product information from Apple can help identify the processor type. Do not assume the type from the Mac’s appearance because similar enclosures can contain different processors.

How do you reset NVRAM on an Intel Mac?

The Intel nvram reset Mac command uses four keys: Option, Command, P, and R. Use the built-in keyboard or a wired Mac keyboard if possible, because a wireless keyboard may not connect early enough during startup.

1. Save your work, then shut down the Intel-based Mac completely.
2. Locate Option, Command, P, and R before turning the Mac on.
3. Press the power button, then immediately press and hold Option-Command-P-R together.
4. Keep holding all four keys for about 20 seconds. The Mac may appear to restart during this period.
5. If the Mac plays a startup sound, release the keys after the second startup sound.
6. If the Intel Mac displays an Apple logo instead of using a startup sound, release the keys after the Apple logo appears and disappears for the second time.
7. Allow the Mac to finish starting normally.

If the key combination does not work, shut down and try again while pressing the keys sooner. Disconnecting unnecessary external devices and using the built-in or a wired keyboard can also prevent the startup command from being missed. A configured firmware password can block some startup key combinations.

How do you reset NVRAM on an Apple silicon Mac?

There is no Option-Command-P-R procedure for a Mac with Apple silicon, including Macs identified in About This Mac by an Apple chip. Apple silicon Macs check NVRAM during startup and handle applicable recovery automatically, so holding the Intel key combination is not a manual reset method on these computers.

For a minor settings problem on Apple silicon, shut down the Mac normally, wait briefly, and start it again. Then check the affected setting. If the problem continues, use Safe Mode or macOS Recovery as the next diagnostic step rather than repeatedly trying the Intel NVRAM shortcut.

How can you confirm that the NVRAM reset worked?

An Intel Mac does not normally display a message saying that NVRAM was cleared. Confirm the reset by checking the settings most likely to have changed after the Mac reaches the desktop:

1. Open Sound settings and check the output volume.
2. Open Displays settings and confirm the resolution and arrangement.
3. Open General settings, then Date & Time, and verify the time zone.
4. Open General settings, then Startup Disk, and make sure the intended macOS disk is selected.
5. Restart once more and confirm that the original symptom does not return.

A changed setting can indicate that the reset took effect, but the best confirmation is that the volume, resolution, time-zone, or startup-disk problem has stopped. Restore any preferred settings that reverted.

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

If the reset nvram Mac procedure does not solve the problem, update macOS if an update is available and restart. Then test the Mac in Safe Mode, which can help identify trouble caused by startup software, fonts, or certain system caches.

For startup-disk trouble, open macOS Recovery and use Disk Utility’s First Aid feature on the startup volume. Do not erase the disk merely to test it. Back up important files before performing more extensive recovery work.

Contact Apple Support if the Mac cannot start, repeatedly shows a question-mark icon, loses the same settings after every shutdown, produces recurring kernel panics, or shows signs of a hardware problem. Have the Mac’s processor type, macOS version, exact symptoms, and the troubleshooting steps already attempted ready when requesting help.