Resetting NVRAM on Mac: A Detailed Troubleshooting Guide

Introduction / Why It's Needed

NVRAM (Non-Volatile Random-Access Memory) is a small area of memory in your Mac where important system settings are stored: volume level, display resolution, selected startup disk, time and date information, and other parameters. Over time, data in NVRAM can become corrupted or outdated, leading to issues like improper system booting, audio malfunctions, incorrect screen display, or loss of settings after a reboot.

Resetting NVRAM clears these settings to their default values, which often resolves the mentioned problems. This guide will help you safely perform a reset on any Mac—whether with Intel or Apple Silicon (M1, M2, M3) processors. After completion, you should have stable macOS operation and correctly preserved settings.

Requirements / Preparation

Before you begin, ensure:

• You have a Mac with an Intel or Apple Silicon processor.
• You know your processor type (check via the Apple menu → About This Mac).
• Your Mac is connected to a power source (for laptops).
• Creating a data backup via Time Machine is recommended (although an NVRAM reset does not affect user files).
• For Mac with Apple Silicon, ensure you use the correct keys (Option instead of Alt).

💡 Tip: If you're unsure of the processor type, check the "Processor" line in the "About This Mac" window. Intel will show "Intel Core...", while Apple Silicon will show "Apple M1/M2/M3...".

Step-by-Step Instructions

Step 1: Determine Your Mac's Processor Type

First, determine which processor is installed in your Mac, as the reset methods differ for Intel and Apple Silicon.

1. Click the Apple menu () in the top-left corner of the screen.
2. Select About This Mac.
3. In the window that opens, find the Processor line.
   • If it says "Intel Core..." — this is an Intel-based Mac.
   • If it says "Apple M1", "M2", "M3" or similar — this is an Apple Silicon Mac.

Remember the processor type to apply the correct method.

Step 2: Reset NVRAM on Mac with Intel Processor

For Mac with Intel processors (including models with T2 Security chip), use the following sequence:

1. Shut down your Mac completely (Apple menu → Shut Down).
2. Turn on your Mac and immediately press and hold the key combination:
   • Command (⌘) + Option (⌥) + P + R
3. Hold the keys for about 20 seconds (on older models, it may take longer until you hear the second startup chime or see the Apple logo).
4. Release the keys. Your Mac will restart automatically.

⚠️ Important: If you have a Mac with a T2 chip (e.g., MacBook Pro 2018 and newer), you may need to enter an administrator password to unlock system settings after the reset. This is normal.

Step 3: Reset NVRAM on Mac with Apple Silicon (M1, M2, M3)

For Mac with Apple Silicon processors, the process differs due to the new architecture:

1. Shut down your Mac completely (Apple menu → Shut Down).
2. Press and hold the power button (the power-on button) for 10 seconds, then release it.
3. Immediately after, press the power button to turn on your Mac and immediately press and hold the key combination:
   • Option (⌥) + Command (⌘) + P + R
4. Hold the keys for 10–15 seconds (you can release when you see the Apple logo or hear the startup chime, but usually holding for 10 seconds is sufficient).
5. Release the keys. Your Mac will continue booting.

⚠️ Important: On Apple Silicon Macs, there is no traditional startup chime for an NVRAM reset. Simply hold the keys for 10–15 seconds.

Verify the Result

After macOS boots, check if the NVRAM settings have been reset:

• Volume level: Check if the sound is set to a minimum or medium level (often resets to 50%).
• Display resolution: Open System Settings → Displays, and ensure the resolution is the default (not changed by the user).
• Startup disk selection: If you used external disks, check that the internal drive is selected by default (Apple menu → Startup Disk).
• Time and date: Check if they are correct (NVRAM stores time when the Mac is off).

If the settings have returned to their defaults, the reset was successful. If a problem (e.g., with booting or sound) persists, repeat the reset, ensuring you hold the keys for the exact recommended duration.

Possible Issues

Keys don't respond or Mac doesn't restart

• Cause: Keys are pressed at the wrong time or not all simultaneously.
• Solution: Shut down your Mac completely, then turn it on and immediately (within 1 second of pressing the power button) press all four keys. For Apple Silicon, ensure you first held the power button for 10 seconds before turning on with the keys.

Settings didn't reset

• Cause: Insufficient key hold time (especially on older Intel Macs, which may require up to 30 seconds) or hardware NVRAM failure.
• Solution: Increase the hold time to 25–30 seconds for Intel Macs. For Apple Silicon, ensure you hold the keys for exactly 10–15 seconds after turning on. If the issue recurs, an SMC reset or service visit may be required.

Booting issues after reset

• Cause: On Mac with T2 chip or FileVault, a password may be required.
• Solution: When prompted for a password, enter an administrator password. If you forgot the password, use your Apple ID to reset or recover via Recovery Mode.

NVRAM reset didn't solve the problem

• Cause: The issue may be related to the SMC (power management), corrupted software, or a hardware fault.
• Solution:
  1. Reset the SMC (for Intel Mac) or boot into Recovery Mode (for Apple Silicon).
  2. Update macOS to the latest version via System Settings → General → Software Update.
  3. Check hardware components via System Information (Utilities → System Information) or contact Apple Support.

💡 Tip: Resetting NVRAM is safe, but it only resets system settings and does not affect your data. If issues are software-related (e.g., apps won't launch), look for other solutions, such as reinstalling macOS or checking the disk with Disk Utility.