macOS Safe Mode: How to Boot and Use

Introduction

Safe Mode in macOS is a special boot mode designed for diagnostics and troubleshooting. When started in this mode, the system checks the disk, loads only the minimal necessary kernel extensions, and disables third-party programs at startup. This helps determine whether a problem is caused by software conflicts, cache corruption, or file system errors. Safe Mode is particularly useful if macOS is unstable, strange errors appear, or the influence of third-party extensions is suspected.

💡 Tip: Safe Mode is not intended for everyday use. After diagnostics, be sure to restart your Mac in normal mode.

Requirements / Preparation

Before starting, make sure that:

• You have a Mac with an Intel or Apple Silicon (M1, M2, M3, etc.) processor.
• You have access to a keyboard (to hold keys).
• You know the user password if your Mac requires a password to log in.
• Your Mac is connected to a power source (for laptops).

⚠️ Important: On Apple Silicon Macs, the process to enable Safe Mode differs from Intel. Both methods are described below.

Starting Safe Mode on an Intel Mac

1. Shut down your Mac completely:
   Click the Apple menu () in the top-left corner and select "Shut Down". Wait for it to power off fully.
2. Turn on your Mac and immediately hold the Shift key (⇧).
   Press the power button, and then, without releasing it, start holding Shift. Hold the key until the Apple logo appears.
3. Release the Shift key after the Apple logo appears.
   Your Mac will continue booting into Safe Mode. A progress indicator (a bar or spinning wheel) may appear on the screen.
4. Wait for the login window.
   Booting into Safe Mode can take longer than usual (up to several minutes) because the system performs a disk check.
5. Log in using your user password.

Starting Safe Mode on an Apple Silicon Mac (M1, M2, M3)

1. Shut down your Mac completely:
   Apple menu () → "Shut Down".
2. Press and hold the power button until the startup options window appears.
   Hold the button for about 5–10 seconds. A screen will appear with a choice of startup disks and a gear icon labeled "Options".
3. Select your startup disk (usually Macintosh HD) and click "Options" (or "Options").
4. In the startup options window, click "Continue".
5. Check the "Safe Boot" option and click "Continue".
6. Wait for the restart and login.
   Your Mac will restart and boot into Safe Mode. This process may take 2–5 minutes.

Verifying the Result

After logging in, confirm that your Mac is running in Safe Mode:

• Visual indicator: The words "Safe Mode" will appear in the Apple menu () in the top-right corner.
• Through System Report:
  Open "About This Mac" → "System Report" → "Software" section. The "Safe Mode" field will show "Yes".
• Terminal (optional):
  Open Terminal and run the command:

  sysctl kern.bootargs
  

  If -x or -s appears in the output, this confirms Safe Mode.

Safe Mode Limitations

In Safe Mode, some macOS functions operate in a limited capacity:

• Third-party kernel extensions (kext), including hardware drivers and utilities, are disabled.
• Caches (font caches, kernel caches) are disabled, which may slow down some applications.
• Some graphics features may be unavailable (e.g., hardware acceleration; external displays may only work at basic resolutions).
• Networking features may be limited (e.g., file sharing may be unavailable).
• Audio over HDMI/DisplayPort may not work.

These limitations are normal and are intended to isolate the system from third-party components.

Potential Issues

Mac doesn't boot into Safe Mode

• For Intel: Ensure you hold Shift immediately after powering on (not after the Apple logo appears). If the key isn't held, the system will boot normally.
• For Apple Silicon: If the startup options window doesn't appear, hold the power button longer (up to 10 seconds). Also, verify that your Mac is fully shut down before pressing the power button.

Forgotten password

If your Mac requires a password to log in and the password is unknown, Safe Mode will not help. In this case:

• Use password reset via Apple ID (if linked).
• Boot into Recovery Mode and reset the password using the "Terminal" utility or "Reset Password".

Problem persists in Safe Mode

If the problem (e.g., freezes or errors) continues in Safe Mode, possible causes include:

• A corrupted system disk — use Disk Utility in Recovery Mode to verify and repair it.
• Hardware malfunction — contact Apple Support or an authorized service provider.

Some programs don't work

Third-party extensions are disabled in Safe Mode, so some applications (e.g., antivirus software, disk utilities) may not launch. This is normal — after restarting in normal mode, they will be available again.