The easiest solution by far is to boot from a different device.
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To boot from another hard drive or a USB flash device, hold down the option key and start up your Mac. The Mac OS startup manager will appear, allowing you to select the device to boot from. To start up in Safe Mode , hold down the shift key and then start your Mac. It will also delete some of the startup caches that may also be preventing your Mac from starting successfully. When First Aid is finished, restart your Mac normally.
You should use this startup mode only for troubleshooting and not for running day-to-day applications. Press return or enter after you type the above line. Fsck will start and display status messages about your startup disk.
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Select your startup disk, then restart your Mac. Press and hold the Option key immediately after turning on or restarting your Mac.
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If your Mac is protected by a firmware password , you can release the key when you're asked to enter the password. Select your startup disk, then click the arrow under its icon, or press Return. If you press and hold the Control key during this step, your selection is saved in Startup Disk preferences, so it persists until you change it.
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If you can't select your startup disk or start up from it Check for these possibilities if you can't see your disk in Startup Disk preferences or Startup Manager, or your Mac won't start up from it. Open the Terminal app, which is in the Utilities folder of your Applications folder. If you want to remove this additional protection but keep your firmware password: Open the Terminal app, which is in the Utilities folder of your Applications folder.
Type the administrator password for your user account, then press Return. Type your firmware password, then press Return. Choose the external drive and hit Enter to continue booting.
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Both of these methods set the external drive as the default. Therefore you can simply unplug it whenever you want to boot to your internal drive instead. When running macOS off an external drive, you still have to shut it down in the normal way.
This could cause you to corrupt your data. You need a full computer reboot to switch from one drive to the other. The entire process of setting your Mac to boot from USB should take around half an hour at most. Or you could install macOS on a flash drive, stick it in a drawer, and keep it for emergencies. Booting your Mac from a USB drive gives you a way to fix any boot problems your computer experiences.
Our guide to troubleshooting all Mac boot problems will get it fixed quickly.
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A Quick Guide to macOS Boot Modes and Startup Key Combinations
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