# Mac Safe Mode: How to Start It and Read the Result

> Start safe mode on Apple silicon or Intel, confirm Boot Mode, see what it skips, and use the result to find a login item or extension causing trouble.

Published: 2026-10-10 | Updated: 2026-10-17

Mac safe mode starts macOS with only what macOS itself needs. It skips login items and extensions that macOS doesn't require, skips fonts that macOS didn't install, runs a basic check of the startup disk and clears some system caches. That makes it a test more than a fix: if a problem goes away in safe mode, something that normally loads at startup is the likely cause.

How you get there depends on the chip. On a Mac with Apple silicon you hold the power button until the startup options appear, then hold Shift and click **Continue in Safe Mode**. On an Intel Mac you hold Shift as the Mac starts up. To leave, choose **Apple menu › Restart** and let it start normally. The steps below come from Apple's [safe mode guide](https://support.apple.com/116946).

## Check which Mac you have first

Choose **Apple menu › About This Mac**. Apple's [Apple silicon article](https://support.apple.com/116943) gives the rule: an item labeled **Chip** followed by a chip name means Apple silicon, and an item labeled **Processor** followed by an Intel processor name means an Intel Mac. The two key sequences are not interchangeable.

## Start in safe mode on Apple silicon

1. Shut down the Mac and wait until it is fully off.
2. Press and hold the power button. Keep holding it until you see **Loading startup options** or the Options icon, then release it.
3. Select your startup disk, which is usually named Macintosh HD.
4. Press and hold Shift, then click **Continue in Safe Mode** below the disk.
5. Log in. The login window may show **Safe Boot** in red.

## Start in safe mode on an Intel Mac

1. Turn on or restart the Mac, then immediately press and hold Shift.
2. Release Shift when the login window appears.

If Shift seems to do nothing, Apple's [startup key combinations page](https://support.apple.com/102603) has two useful notes: shut down first instead of restarting when a combination does not register, and give the keyboard a few seconds to be recognized, using a built-in or wired keyboard if you can. A firmware password can also stop some combinations from working.

## Confirm you are actually in safe mode

There are two signs. The login window may show **Safe Boot** in red in its upper-right corner. For a check that does not depend on catching the login window, hold Option and choose **Apple menu › System Information**, click **Software** in the sidebar and read the overview: **Boot Mode: Safe** means safe mode, and **Normal** means the key combination did not take.

Do this before you draw any conclusion. A test run in normal mode by mistake tells you nothing about startup items.

## What safe mode turns off, and why that is the test

A normal login loads a lot more than macOS. Apps you registered under **System Settings › General › Login Items & Extensions**, background helpers that apps install for updates or syncing, menu bar utilities, input methods, third-party extensions and fonts you added all start without being asked. Any of them can slow a login, crash, hold a file or fight another app.

Safe mode removes that whole layer at once. Apple lists three things it does:

| What safe mode does | What it means for your test |
| --- | --- |
| Prevents login items, nonrequired extensions and fonts not installed by macOS from loading | Software you or your apps added does not run |
| Runs a basic check of the startup disk | A simple file system problem may be repaired along the way |
| Clears some system caches, including font caches and the kernel cache | Stale caches are rebuilt when needed |

Because it does all three at once, a clean safe mode result has two possible explanations, and the next section is how you tell them apart.

Safe mode also leaves some features unreliable while you are in it. Apple names video capture, graphics performance, file sharing, Wi-Fi, accessibility features, audio devices and devices connected by USB, Thunderbolt or FireWire as things that might not work as expected. So a choppy screen or missing audio device in safe mode is expected, not a new fault.

## Read the result

**The problem disappears in safe mode.** Restart normally and try again. If the problem stays gone, Apple notes that the disk check or cache clearing safe mode did at startup may have resolved it, and you can stop there.

**The problem comes back after a normal restart.** Now the likely cause is a login item or other software that safe mode prevented from loading. Apple's suggested order is to remove login items in System Settings and restart to see whether one of them is responsible, then to test in a new user account, since software in your original account may be the cause. Change one thing at a time: switching off ten items and seeing the problem leave does not tell you which one it was.

**The problem continues in safe mode.** Startup software is unlikely to be the cause, because it did not load. Apple's next step here is to reinstall macOS, and it notes that reinstalling macOS doesn't remove your personal files. Hardware faults, a full startup disk and problems in your user data are other candidates. A nearly full disk is worth ruling out first; see [what to do when the startup disk is full](https://mole.fit/blog/mac-startup-disk-full).

## Find the startup item after a positive result

Start with the visible list. **System Settings › General › Login Items & Extensions** shows Open at Login items and the apps allowed to run in the background. Apple's [login items guide](https://support.apple.com/guide/mac-help/mh15189/mac) covers adding and removing them. Turn off the item you suspect, restart normally, and test the problem again.

Background services are harder to see, because apps install them as launch agents and daemons rather than as visible login items. Read-only commands list what is loaded in your session and what is installed on disk:

```
launchctl list | grep -v com.apple
ls ~/Library/LaunchAgents /Library/LaunchAgents /Library/LaunchDaemons
```

Treat the output as a list of names to look up, not a list to delete. Many entries belong to apps you still use, and removing a security, VPN or management agent by hand can leave software half working. The [startup programs guide](https://mole.fit/blog/how-to-disable-startup-programs-on-mac) explains how each kind is controlled and why disabling an app's toggle is safer than deleting its files.

In [Mole](https://mole.fit/), **Software › Startup** lists login items and background services, and for items macOS lets it manage it offers **Block startup** and **Allow startup**, so you can switch one item off, restart and switch it back on if it was not the cause. Items it cannot manage safely are marked **Manage in System Settings** instead. Safe mode itself is entered and left outside Mole.

## Leave safe mode

Choose **Apple menu › Restart**. Do not hold any keys. The next startup is normal, your login items and extensions load again, and the caches safe mode cleared are rebuilt as macOS needs them.

If you are not sure you left it, check **Boot Mode** in System Information again.

## What safe mode is not

Safe mode is not a cleanup tool. It clears some system caches as a side effect, and those caches are rebuilt later, so do not use it to free storage. It is not a performance setting either: features such as graphics acceleration and Wi-Fi may behave worse while you are in it. And it does not remove anything. A problem login item is still installed when you restart normally, which is exactly what makes the before-and-after comparison work.

If your Mac got slow right after an update rather than at login, the cause is often finite background work such as indexing; [a Mac that is slow after a macOS update](https://mole.fit/blog/mac-slow-after-macos-update) covers how to tell.

## FAQ

### How do I boot a Mac in safe mode with Apple silicon?

Shut down, then press and hold the power button until **Loading startup options** appears. Select the startup disk, hold Shift and click **Continue in Safe Mode**. Holding Shift at startup is the Intel method and does not work on Apple silicon.

### How do I know if my Mac is in safe mode?

Look for **Safe Boot** in red at the top right of the login window, or hold Option, choose **Apple menu › System Information**, select **Software** and check that **Boot Mode** reads **Safe**.

### Does safe mode delete anything on my Mac?

It clears some system caches, including font caches and the kernel cache, which macOS rebuilds as needed. It does not delete your files, apps or login items; they simply do not load during that session.

### How do I get out of safe mode on a Mac?

Choose **Apple menu › Restart** without holding any keys. The Mac starts normally and loads your login items and extensions again.

### Why does my Mac work in safe mode but not normally?

If the problem returns only after a normal restart, a login item, background service, extension or added font that safe mode skips is the likely cause. Turn suspects off one at a time and restart after each change to find which one.

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