Safe Mode on Windows and macOS: When and How to Use It for Troubleshooting
Key Takeaways
- Safe mode loads your OS with only essential drivers and system files, excluding third-party software.
- Windows and macOS have different methods for entering safe mode — neither requires advanced technical skill.
- Use safe mode to confirm whether a problem is caused by software, a driver, or the OS itself.
- Most everyday troubleshooting tasks, like uninstalling a bad driver, can be completed from within safe mode.
- Exiting safe mode simply requires a normal restart on both Windows and macOS.
What you will need
What Safe Mode Actually Does
Safe mode is a stripped-down version of your operating system that loads only the drivers and system files your OS absolutely requires to run. Third-party applications, non-essential drivers, and most startup programs are bypassed entirely. Think of it as your OS with everything optional switched off.
This minimal environment is valuable because it creates a controlled baseline. If a problem — say, a persistent crash or a frozen desktop — disappears in safe mode but reappears in normal mode, you can confidently conclude that the OS core itself is not at fault. The cause is something layered on top: a browser extension, an antivirus program, a graphics driver, or another piece of third-party software.
Safe mode is one of several built-in diagnostic approaches available on modern computers. For a broader look at what Windows and macOS offer natively, see our guide to built-in diagnostic tools. And if you're curious how each OS handles fundamental tasks differently, this OS comparison provides useful context.
Back Up Before You Begin
If your computer is experiencing serious instability — such as frequent crashes or failure to boot — back up important files to an external drive or cloud storage before attempting any troubleshooting. Safe mode is a diagnostic environment, not a recovery tool, and it does not protect your data from hardware failures.
Tools and Access You'll Need
Safe mode doesn't require any special software, but a few things must be in place before you start.
What you will need
Windows PC or laptop
The device you'll boot into Windows Safe Mode for troubleshooting.
Mac computer (Intel or Apple Silicon)
The device you'll boot into macOS Safe Mode; the entry method differs by chip type.
External keyboard (Mac users)
Required on some Mac desktops to hold the Shift key during startup for safe mode entry.
Administrator account credentials
Safe mode on both platforms may require admin login to make system-level changes.
Step-by-Step Instructions
Follow the steps below in order. Steps 2 through 4 cover platform-specific entry methods — skip to the one that matches your device.
Identify what problem you're trying to isolate
Before entering safe mode, write down exactly what's going wrong: crashes, a specific app failing, display problems, or slow performance. This helps you test systematically once inside safe mode rather than guessing. If the issue is absent in safe mode, a third-party driver or app is the likely culprit.
Enter Safe Mode on Windows 10 or 11
Open Settings → System → Recovery. Under Advanced startup, click Restart now. After the restart, select Troubleshoot → Advanced options → Startup Settings → Restart. When the Startup Settings screen appears, press 4 for Safe Mode or 5 for Safe Mode with Networking (useful if you need internet access to download a fix).
Enter Safe Mode on a Mac with Apple Silicon (M-series)
Shut down your Mac completely. Press and hold the power button until you see Loading startup options. Select your startup disk, then hold Shift and click Continue in Safe Mode. Log in as normal — your Mac will display Safe Boot in the menu bar to confirm the mode is active.
Enter Safe Mode on an Intel-based Mac
Shut down your Mac. Turn it on, then immediately press and hold the Shift key. Release Shift when the login window appears. The words Safe Boot will appear in red at the top-right corner of the login screen. Log in to confirm you're in safe mode.
Perform your troubleshooting tasks
With safe mode active, attempt to reproduce the original problem. If it's gone, use this opportunity to uninstall recently added apps, roll back a driver (on Windows: Device Manager → right-click the device → Properties → Driver → Roll Back Driver), or delete problematic startup items. On macOS, you can remove login items via System Settings → General → Login Items.
Exit safe mode and verify the fix
On both Windows and macOS, simply restart your computer normally — do not hold any keys. The system will boot back into its full operating environment. Test whether the original problem has been resolved. If the issue returns, safe mode has confirmed it's software-related, and you can continue investigating with that confidence.
Test in Safe Mode First
If the problem you're experiencing — such as a crash or display glitch — disappears entirely in safe mode, the cause is almost certainly a third-party app, browser extension, or recently installed driver. Use that insight to narrow your investigation before returning to normal mode.
When Safe Mode Doesn't Resolve the Issue
If your problem persists even in safe mode, the issue likely lies within the core OS, your hardware, or a corrupted system file rather than a third-party application. On Windows, tools like System File Checker (sfc /scannow run from an elevated Command Prompt) can scan and repair corrupted system files. On macOS, Disk Utility's First Aid function can check and repair filesystem errors.
Hardware problems — a failing drive, overheating, or faulty RAM — will not be resolved by safe mode at all, since safe mode only controls which software loads. If you suspect hardware, the logical next step is running platform-specific hardware diagnostics (Windows Memory Diagnostic or Apple Diagnostics, respectively).
It's also worth distinguishing safe mode from simply restarting. A restart clears temporary software states and can fix many minor glitches on its own — but it doesn't isolate which software caused the problem the way safe mode does. For more on what different power states do and don't fix, see common myths about restarting and sleep mode.
Don't Use Safe Mode as Your Regular Environment
Safe mode disables networking features, audio drivers, and many system services. It is intended only for short-term troubleshooting. Running your computer in safe mode long-term can prevent updates from installing and may cause unexpected application behavior.