Reset PRAM on a Mac: Step-by-Step Guide

To reset PRAM or NVRAM on an Intel-based Mac, start the Mac and immediately hold Option-Command-P-R for about 20 seconds. Apple silicon Macs do not use this key combination; restart the Mac normally and use startup options or macOS Recovery if the problem continues.

PRAM is the older name for a small memory area that keeps certain Mac settings when the computer is turned off. Modern Macs use NVRAM, but “macOS PRAM reset,” “macOS reset PRAM,” and “Mac OS reset PRAM” commonly refer to the same troubleshooting step.

What does resetting PRAM or NVRAM do?

Resetting PRAM or NVRAM clears selected system settings and lets macOS create fresh values. It does not erase documents, photos, installed apps, or user accounts.

Depending on the Mac, NVRAM may retain settings or diagnostic information related to:

• Speaker volume
• Display resolution
• Startup disk selection
• Time zone
• Information about a recent unexpected shutdown or kernel panic

A reset can help when an Intel Mac starts from the wrong disk, uses an unexpected display resolution, has unusual startup sound behavior, or retains another setting that does not respond normally. It is a focused troubleshooting step, not a general repair for every macOS problem.

What should you do before resetting PRAM?

Prepare for the PRAM reset before shutting down the Mac:

1. Save your work and close every open app.
2. Write down any custom display resolution, sound output, time zone, and startup disk settings that you may need to restore.
3. Confirm whether the Mac has an Intel processor or Apple silicon. Open the Apple menu and select About This Mac. A Chip entry identifies Apple silicon; a Processor entry naming Intel identifies an Intel Mac.
4. Use the built-in keyboard or connect a wired keyboard if possible. A wireless keyboard may not be recognized early enough during startup.
5. If the Intel Mac starts in Windows through Boot Camp, select macOS as the startup system before attempting the key combination.

A normal PRAM reset should not affect personal files, but maintaining a current backup is sensible before any troubleshooting that could lead to additional recovery steps.

How do you reset PRAM on an Intel Mac?

1. Shut down the Intel Mac completely.
2. Locate Option, Command, P, and R on the keyboard so you can press them together.
3. Press the power button, then immediately press and hold Option-Command-P-R.
4. Keep holding all four keys for about 20 seconds. The Mac may appear to restart during this time.
5. Release the keys after about 20 seconds and allow the Mac to start normally.

On an older Mac that plays a startup sound, you may hear the sound twice; release the keys after the second sound. On an Intel Mac with the Apple T2 Security Chip, the Apple logo may appear and disappear twice; release the keys after it disappears for the second time. Some Macs provide no clear sound or screen cue, so holding the keys for about 20 seconds is the more dependable measure.

If the Mac starts normally without an apparent reset, shut it down and try again with the built-in or a wired Mac keyboard. Startup key combinations may not work while a firmware password is enabled.

How do you reset PRAM on an Apple silicon Mac?

The classic Option-Command-P-R reset does not apply to a Mac with Apple silicon, including M-series Mac models. Do not keep repeating the Intel key sequence on these computers.

For an Apple silicon Mac, begin with a normal restart. If the problem remains, shut down the Mac, wait briefly, and turn it on again. macOS manages NVRAM on these models without the manual Intel startup-key procedure.

For deeper startup troubleshooting on Apple silicon:

1. Shut down the Mac.
2. Press and hold the power button until “Loading startup options” appears.
3. Select the usual startup disk to test a normal startup, or select Options and Continue to enter macOS Recovery.
4. From startup options, use safe mode, Disk Utility, or other recovery tools only when they match the symptom you are investigating.

What should you check after resetting PRAM?

After an Intel Mac completes the PRAM or NVRAM reset, sign in and check the settings that may have returned to defaults:

• Confirm the correct time zone and current date and time.
• Check the display resolution, refresh rate, arrangement, and scaling.
• Restore the preferred alert and speaker volume.
• Confirm the intended sound input and output devices.
• Open Startup Disk settings and select the correct disk if the Mac has more than one startup option.

Restart the Mac once more after making changes. Then test the specific symptom that prompted the reset instead of changing several unrelated settings at once.

What should you do if a PRAM reset does not help?

If resetting PRAM does not fix the Intel Mac, the cause may involve software, a connected device, the startup disk, or hardware rather than NVRAM. Try these steps in order:

1. Install available macOS updates from System Settings.
2. Shut down the Mac, disconnect nonessential accessories, and test it again.
3. Start in safe mode to check whether startup software contributes to the problem.
4. Use Disk Utility in macOS Recovery to examine and repair the startup disk.
5. Run Apple Diagnostics if the Mac shows signs of a hardware problem.

Contact official Apple Support if the Mac will not start, repeatedly shows a question-mark folder or blank screen, reports a hardware issue, or continues misbehaving after these checks. Open {site} and choose the support option for the Mac model and symptom; avoid following unverified phone numbers or repair instructions found elsewhere.