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.These are the actions I tried after reading the apple recovery pages. If you're using a keyboard made for a PC, such as a keyboard with a Windows logo, try a keyboard made for Mac. OSX Utilities Screen appears on start up but unable to recover start up disk I have IMac (2009) with Mountain Lion downloaded in Nov 2012 and have always downloaded all updates since then.When I switched on today a grey screen appeared then OSX Utilities screen. Run the following command ( exactly as shown here - write it down or take a picture with another device so you aren't missing a symbol when typing into the Terminal window): Bash: nvraminfo (nvram -p grep -Ei 'ue. Or use your built-in keyboard or a wired keyboard. From the menu bar choose Utilities->Terminal. 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. If you can't shut down, press and hold the power button for up to 10 seconds, until your Mac turns off. 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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