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It can be any random issue from iCloud not allowing you to sign in to certain apps just not opening. Sometimes specific processes on your Mac just don't work. Reset the NVRAM and PRAM: option-command-P-R Release the N key when you see the choices appear.Start or restart your Mac and immediately press and hold the N key on your keyboard.Your Mac must have capable firmware to boot from a system. (Image credit: iMore / Gerald Lynch) Start up from a NetBoot server: Nīooting from a NetBoot server allows you to boot from a network, rather than a local hard disk or optical disk drive. You can also hold option-D to start up from either utility over the internet. Select Apple Hardware Test or Apple Diagnostics.Release the D key when you see the choices appear.Start or restart your Mac and immediately press and hold the D key on your keyboard.How to start up from the Apple Hardware Test or Apple Diagnostics You can run Apple Diagnostics once you think you've isolated the issue to a possible hardware issue. If there are issues with your Mac that you think may be related to the hardware, you can run the Apple Hardware Test. Start up from Apple Hardware Test or Apple Diagnostics: D Click the arrow or press return on your keyboard.Release the option key when you see the Startup Manager window.Start or restart your Mac and immediately press and hold the option key on your keyboard.

So if you have your Mac partitioned to run Windows or a macOS beta, for example, you can select that startup disk instead of the default disk. The Startup Manager lets you choose a different startup disk during boot. You can leave safe mode by restarting your Mac without pressing any keys during startup.