How to Reset PRAM, NVRAM, and SMC on a Mac

If your Mac’s battery, fans, display, sound, or startup settings feel like they’re behaving a little bit “off”, resetting PRAM/NVRAM or the SMC can sometimes help. 

These resets are simple, low-risk troubleshooting steps — but the right option depends on your Mac’s model, and the exact symptoms you’re seeing. Before we dive in, let’s take a quick look at what these resets are.

Quick Summary: PRAM, NVRAM, and SMC Resets Explained

At a glance:

• PRAM/NVRAM stores small system settings your Mac needs to remember after shutting down. These include volume, display resolution, startup disk selection, time zone, and some boot-related preferences. Resetting it can help if those settings are behaving incorrectly. 

• SMC stands for System Management Controller. On Intel-based Macs, it manages hardware functions like power, battery charging, fan behaviour, thermal management, keyboard backlighting, and sleep/wake responses. 

• Macs that use Apple silicon, such as an M-series chip, work differently. On these systems, there is no manual SMC reset process like there is on older Intel models. In many cases, fully shutting down the Mac, waiting for a few minutes, and turning it back on performs a similar reset. 

Typically, these resets are safe and don’t put your personal files at risk. However, they’re not universal fixes. Whatever you do, avoid resetting repeatedly for no reason, and don’t rely on PRAM/NVRAM or SMC resets if your files are missing, your internal drive isn’t being recognised, or you suspect storage failure. In those cases, the issue is likely a result of something deeper.

What Are PRAM, NVRAM, and SMC?

PRAM, NVRAM, and SMC all play a unique role in the way your Mac stores settings and controls basic hardware behaviour. 

PRAM stands for Parameter Random Access Memory. It is the older term Apple used for a small amount of memory that stores system settings your Mac needs to remember after shutdown. This includes things like speaker volume, display resolution, startup disk selection, and time zone information. 

NVRAM, or Non-Volatile Random Access Memory, is the newer equivalent of PRAM. It serves a similar purpose to PRAM, but is used on more modern Intel-based Macs. You may see many guides still saying “reset PRAM” — but in practice, newer Intel Macs are usually resetting NVRAM. 

The SMC, or System Management Controller, is different. This applies specifically to Intel-based Macs and controls low-level hardware functions, including power management, battery charging, fan behaviour, thermal management, keyboard backlighting, and sleep/wake responses. 

Here’s the bottom line: PRAM/NVRAM stores small system preference, while the SMC manages hardware-level behavior. Understanding the difference will help you choose the right reset for the problem you’re trying to resolve. 

When Should You Reset PRAM/NVRAM or SMC? 

Before you try either type of reset, start with a full shutdown. In some cases, particularly on newer Macs, just fully powering down your computer, letting it rest for a few moments, then turning it back on can clear up minor glitches. If the issue keeps coming back, the next step is to match up the symptoms you’re seeing with the right type of reset.

In general, PRAM/NVRAM resets are most helpful for small system-setting problems, while SMC resets are better for power, battery, fan, and thermal issues on Intel-based Macs. 

As a rule of thumb, the table above does work — though things aren’t always quite as clear-cut. Some symptoms can overlap, especially if your Mac is showing unusual display and power-related behaviours. For example, brightness issues sometimes point to stored settings, but on Intel Macs, they’re more often linked to the SMC.

Before You Reset Anything: Restart and Identify Your Mac Type

Before resetting anything, start with a full shutdown rather than a simple restart. Shut down your Mac completely, wait a few moments, then power it back on. It may sound trivial, but this can clear minor glitches on its own, and on Apple silicon Macs, it often replaces the older manual reset process.
Once you’ve done this, you’ll need to check which type of Mac you have, because your reset steps will depend on this.

To identify your Mac:

1. Click the Apple menu in the top-left corner.
2. Select About This Mac.
3. Look for either Processor or Chip.
4. If it says Intel, follow the Intel reset instructions later in this guide.
5. If it says Apple M1, M2, M3, or another Apple silicon chip, follow the Apple silicon guidance instead.

Using the wrong instructions for your reset won’t usually help, so knowing your Mac type before proceeding will save you time before you move on. 

How to Reset PRAM/NVRAM on an Intel Mac

If you’re wondering how to reset PRAM or NVRAM, the good news is that they both use the same reset process on Intel-based Macs. This reset can help if your Mac is having trouble with volume settings, display resolution, startup disk selection, time zone settings, or certain boot-related configurations. 

Follow these steps to reset your PRAM/NVRAM:

1. Shut down your Mac completely.
2. Press the power button to turn it back on.
3. Immediately press and hold these four keys together: Option + Command + P + R.
4. Keep holding the keys for about 20 seconds.

5. Release the keys after your Mac restarts, or after the Apple logo appears and disappears for the second time.
6. Once your Mac finishes starting up, check your settings. You may need to adjust things like volume, display resolution, startup disk, or time zone again.

Note that you’ll need to use a Mac-compatible keyboard for this shortcut to work. If you’re using a wireless keyboard and the key combination doesn’t register in time, try again with a wired keyboard. 

How to Reset the SMC on a Mac

If you’re looking up how to reset PRAM and SMC, remember: these are two different processes. 

An SMC reset only applies to Intel-based Macs, and the steps vary depending on the model you're using. Apple silicon Macs don’t have a separate manual SMC reset process. In most cases, a full shutdown and restart is the closest equivalent, and often, it will get the job done.

If you are unsure which Mac model you have, it’s best to check first before using any reset method.

Reset SMC on a Macbook with Apple T2 Chip

If you’re using an Intel MacBook Air or a MacBook Pro model with an Apple T2 Security chip, follow these steps to reset SMC:

1. Shut down your Mac.
2. Press and hold Control + Option on the left side of the keyboard and Shift on the right side for 7 seconds.

3. While still holding those keys, press and hold the power button as well.
4. Keep holding all four keys for another 7 seconds.
5. Release all keys.
6. Wait a few seconds, then press the power button to turn your Mac back on.

This reset may help if your Mac has power, charging, fan, or sleep/wake issues.

Reset SMC on an Intel Macbook Without a T2 Chip

Follow these steps to reset SMC on older MacBooks with a non-removable battery and no T2 chip:

1. Shut down your Mac.
2. Press and hold Shift + Control + Option on the left side of the keyboard.

3. While holding those keys, press and hold the power button.
4. Hold all four keys for 10 seconds.
5. Release all keys.
6. Press the power button again to turn your Mac back on.

This is the standard SMC reset method for many older Intel MacBook Air and MacBook Pro models.

Reset SMC on an Intel Desktop Mac

If you’re running an Intel iMac, Mac mini, or Mac Pro, the process is a little simpler:

1. Shut down your Mac.
2. Unplug the power cord.
3. Wait 15 seconds.
4. Plug the power cord back in.
5. Wait 5 seconds.
6. Press the power button to turn the Mac on.

If you’re dealing with power-related issues on Intel desktop Macs, these steps may help.

Reset SMC on an Older Macbook with a Removable Battery

If you have an older Intel MacBook with a removable battery, follow these steps: 

1. Shut down your Mac.
2. Remove the battery.
3. Press and hold the power button for 5 seconds.
4. Reinsert the battery.
5. Turn the Mac back on.

What If You Have an Apple Silicon Mac?

Apple silicon Macs do not use the same manual PRAM/NVRAM or SMC reset steps as Intel-based models. This means that the key combinations we’ve talked about so far, such as Option + Command + P + R, or SMC reset shortcuts, aren’t usually needed on Macs with M-series chips. 

To perform a similar low-level settings refresh on an Apple silicon Mac: 

1. Shut down your Mac completely.
2. Wait at least 30 seconds.
3. Press the power button to turn it back on.

This simple shutdown process often resolves the types of issues that users of older Intel Macs might have addressed with an SMC reset.

If the problem continues, try updating macOS, booting into macOS Recovery, or running Apple Diagnostics to check for hardware issues (we’ll dive into how to do this in the next section). If your Mac still behaves unexpectedly after that, the issue is likely something beyond stored settings, and needs further diagnosis. 

What to Do If PRAM/NVRAM or SMC Reset Does Not Work

If resetting PRAM/NVRAM or the SMC doesn’t resolve the issue you’re dealing with, the problem may be more serious than a stored setting. It may be caused by a hardware fault, a battery or power problem, storage issue, macOS corruption, or even a logic board failure.

Your best bet is to run Apple Diagnostics, which can help identify hardware-related problems. 

How to Run Apple Diagnostics

To run Apple Diagnostics, follow the relevant steps below depending on the Mac model you’re using. 

On an Apple silicon Mac:

1. Shut down your Mac.
2. Press and hold the power button until startup options appear.
3. Press Command + D.

On an Intel Mac:

1. Shut down your Mac.
2. Turn it on and immediately hold D.
3. Release the key when you see a progress bar or language selection screen.

Once the test finishes, Apple Diagnostics will display any reference codes it finds. It’s a good idea to write these down or take a photo of them — if the issue is serious, these can be helpful when you reach out to Apple Support or a repair specialist.

Keep in mind that Apple Diagnostics doesn’t always catch everything. It may fail to detect various software-related issues, and doesn’t fully test all external devices or storage issues.

When to Worry About Data Loss

Resetting PRAM/NVRAM or the SMC is usually safe, and you won’t have to worry about losing access to your personal files. These resets are designed to refresh stored settings and low-level hardware behaviour, and don’t affect your documents, photos, or apps.

However, some symptoms that look like settings-based issues can sometimes be a sign of deeper storage or hardware issues. If your Mac has any of the following symptoms, stop troubleshooting and seek professional assistance:

• Files are missing, corrupted, or inaccessible
• Your Mac doesn’t recognise the internal drive
• You see repeated startup errors
• The Mac freezes when you try opening or copying files
• You hear unusual noises from an older HDD-based Mac or external drive

In these cases, repeatedly restarting, updating, or attempting to repair may even make recovery more difficult — and at this stage, your best bet is letting a professional step in.

Know When To Stop And Get Expert Help

Resetting PRAM/NVRAM or the SMC can fix certain Mac behaviour issues, but it’s not a substitute for diagnosing deeper hardware or storage problems. 

Start with a full shutdown, confirm whether your Mac uses Intel or Apple silicon, and follow the correct reset steps carefully.

If the resets don’t work, or if your Mac still shows startup errors, freezes when you try to access files, or fails to recognise the internal drive, stop troubleshooting before the problem gets worse. In some cases continuing to restart, update, or repair a failing system can put your data at risk of permanent loss.

If you’re worried about losing your files, don’t take any chances — reach out to us at Secure Data Recovery today. We can help with professional Mac data recovery, and thanks to our No Data, No Recovery Fee guarantee, it won’t cost you a penny until we recover your files. 

Give us a call at 0800-102-6925 or start your case online today!