Safe Mode starts macOS in a basic state. This mode is designed to fix various macOS problems. Starting your Mac in Safe Mode is really simple. You just need to press and hold the Shift key while you start or restart your Mac. This will allow you to spot the errors better and perform other checks which can help you find the core issue why your MacBook Pro won’t start. Occasionally, doing that then restarting fixes the problem. Or use Option-D to start up to this utility over the Internet. When you boot in Safe Mode, your Mac will check its startup volume, only load necessary kernel extensions, and disable third-party fonts and startup options. The MMacBook Pro won’t turn on issue can also be fixed by starting the device in safe mode. So if you have hit a major snag with your Mac, here's a helpful guide to boot it into a safe mode to fix it. Step 1. Safe Mode is a macOS diagnostic mode designed to fix several problems in your Mac. D: Start up to the Apple Diagnostics utility. After safe boot has served its purpose: to boot in normal mode, either reset NVRAM or reuse Recovery OS to set what's required in NVRAM. How to Start Your Mac in Safe Mode. It’s like Safe Mode on Windows —it won’t load third-party hardware drivers or startup programs, so you can use this mode to fix problems if your Mac isn’t working or booting properly. Safe Mode (or safe boot) is a diagnostic mode of macOS. N: Start up from a NetBoot server, if your Mac supports network startup volumes. Start your Mac and immediately press and hold the shift key. Boot your Mac in Safe Mode. Disabled when using a firmware password. If you are trying to resolve issues with your Mac, safe mode can be extremely useful. Shift (⇧): Start up in safe mode. This article explains how you can tell if your Mac computer is started in Safe Mode. This wikiHow teaches you how to restart your Mac into Safe Mode. It is basically a stripped-down Mac OS that will provide you with limited functionality which you will be able to use in order to troubleshoot system issues with ease. Starting your computer in Safe Mode is one of the most common troubleshooting and maintenance methods. Likewise, if your Mac restarts several times and then shuts down while starting up in safe mode, the best course of action is to start again fresh and reinstall macOS plus any … If your Mac does not start up, even in Safe Mode, then it indicates a problem with your Mac’s hard drive formatting. Disabled when using a firmware password. Since the file system’s integrity is crucial for the stability of your Mac and any data on it, if you are experiencing this problem, your best bet is to try fixing your hard drive’s formatting. If the Mac won't boot with all peripherals disconnected, try booting in Safe Mode by holding down the Shift key when you restart. Booting your Mac in Safe Mode may help you troubleshoot issues with your Mac.