If you're using Boot Camp to start up from Microsoft Windows, set Startup Disk preferences to start up from macOS instead. Then shut down or restart and try again.Some key combinations don't work when your Mac is using a firmware password. Choose the Utilities > Startup Security Utility menu item from the macOS utilities window to open the startup security utility.Click Enter macOS.If you're using a keyboard made for a PC, such as a keyboard with a Windows logo, try a keyboard made for Mac. Or use your built-in keyboard or a wired keyboard. If you're using a wireless keyboard, plug it into your Mac, if possible.Some keyboards have a light that flashes briefly at startup, indicating that the keyboard is recognized and ready for use. You might need to wait a few seconds before pressing the keys, to give your Mac more time to recognize the keyboard as it starts up.Then press and hold the key combination after pressing the power button to turn on your Mac. Or use the OS X installation disc that came with your machine or buy a new one to. Download the relevant macOS or OS X installer from Apple, then use Terminal to create a USB installer you can boot up from. If you can't shut down, press and hold the power button for up to 10 seconds, until your Mac turns off. Install macOS or OS X from Internet Recovery Mode, which you can boot into by holding option+command+R while your Mac powers up. If you can't get a key combination to work when restarting your Mac, shut down your Mac first.Press and hold all keys in the combination together, not one at a time.
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