How to Reset NVRAM on a Mac (and Why Apple Silicon Has No Key Combination)

Advice to “reset the NVRAM” is everywhere, and on most Macs sold in the last few years the key combination it tells you to press does not exist. Apple’s own documentation is the clearest evidence: Option-Command-P-R : Reset NVRAM or PRAM appears in the startup key combinations page under the heading On an Intel-based Mac. The Apple silicon section of that same page lists exactly one action — press and hold the power button until the startup options screen appears.

So before working out how to reset it, it is worth knowing what NVRAM holds and whether it has anything to do with your problem. Everything below was read on macOS 26.5.2 with commands that change nothing.

What NVRAM actually stores

NVRAM is a small amount of memory that survives power loss, holding settings the Mac needs before macOS is running. You can list what is in yours:

$ nvram -p | cut -f1
BluetoothInfo
boot-breadcrumbs
boot-image-last
prev-lang:kbd
supervised
IDInstallerDataV2
LocationServicesEnabled
boot-volume
lts-persistance
upgrade-boot-volume
prev-lang-diags:kbd
SystemAudioVolumeExtension
bluetoothExternalDongleFailed
wlancprops
panicmedic-auxkc-present
auto-boot
BluetoothUHEDevices
ota-updateType
display-crossbar0
SystemAudioVolume

Names only — cut -f1 drops the values, some of which are binary. There were 22 variables on this machine. Even without the values, that list tells you the scope of a reset: startup disk (boot-volume), keyboard and language for the login screen (prev-lang:kbd), startup chime volume (SystemAudioVolume), whether the Mac powers on when it gets power (auto-boot), some Bluetooth and Wi-Fi state, and a few update and diagnostics breadcrumbs.

What is not in there matters just as much. No user files, no app settings, no network passwords beyond that low-level state, nothing about your account. This is why resetting NVRAM is harmless in the sense people mean — and also why it fixes far less than it is credited with.

Reading and checking a single variable

Any variable can be read by name, and a missing one has its own distinct message:

$ nvram SystemAudioVolume
SystemAudioVolume	%80

$ nvram boot-args
nvram: Error getting variable - 'boot-args': (iokit/common) data was not found

That second result is the healthy one for boot-args: the variable does not exist because nothing ever set it. It is worth checking before any reset, because stale kernel arguments left behind by an old troubleshooting session or a since-removed tool are one of the few NVRAM problems that genuinely breaks things — and they can be removed on their own with sudo nvram -d boot-args, no reset required. The same check is part of working through a Mac that hangs at startup.

Deleting one variable is almost always a better move than clearing everything. If a Mac boots to the wrong disk, boot-volume is the variable involved; if the startup chime is at an unwelcome volume, SystemAudioVolume is. Neither justifies wiping the rest.

Resetting on Apple silicon

There is no key combination, and there is no menu item. Apple’s startup key combinations page places Option-Command-P-R under Intel-based Macs only, and the Apple silicon section documents just the power-button startup options screen. Holding those four keys on an Apple silicon Mac does nothing at all.

What replaced it is a full shutdown. On these machines the firmware evaluates and repairs this state as part of starting up, so shutting down completely — not restarting — waiting a few seconds and powering on again is the closest equivalent, and it is what remains after all the guides telling you to press keys.

If a specific variable is the problem, the nvram command still works and is more precise than any reset would have been. sudo nvram -d name deletes one; sudo nvram -c clears all of them, which is the deliberate version of what the old key combination did.

Resetting on an Intel Mac

On an Intel Mac the documented combination applies: shut down, turn it on and immediately hold Option-Command-P-R, and keep holding for about 20 seconds. Apple’s guidance for these combinations is worth following literally — press and hold all keys together rather than one at a time, and if it will not take, shut the Mac down first rather than restarting.

Afterwards, expect to reset a few things: startup disk selection, display resolution on some setups, time zone, and the startup chime volume are the usual ones. That is the entire cost, and it maps exactly onto the variable names listed earlier.

When it is worth doing at all

Given what is actually stored, the honest list of symptoms an NVRAM reset can address is short:

• The Mac starts from the wrong disk, or takes a long pause before choosing one.
• The startup chime is loud or silent regardless of your volume setting.
• The login window comes up in an unexpected language or keyboard layout.
• Display settings behave oddly from the moment the Mac powers on, before macOS loads.

Everything else that gets blamed on NVRAM — slow performance, Wi-Fi dropping, apps crashing, a battery that will not charge past a certain point — involves state that lives elsewhere entirely. Those 22 variables simply have no bearing on it.

The same goes for the advice to reset the SMC alongside it. Apple silicon Macs have no SMC to reset either, so a good deal of the standard “reset both” ritual is, on a modern Mac, two things that do not exist followed by a shutdown that would have done the same job on its own.