Disabled in macOS Mojave or later.Įject (⏏) or F12 or mouse button or trackpad button: Eject removable media, such as an optical disc. To use the default boot image on the server, press and hold Option-N instead.Ĭommand-S: Start up in single-user mode. N: Start up from a NetBoot server, if your Mac supports network startup volumes. Or use Option-D to start up to this utility over the internet. Option (⌥) or Alt: Start up to Startup Manager, which allows you to choose other available startup disks or volumes.ĭ: Start up to the Apple Diagnostics utility. macOS Recovery installs different versions of macOS, depending on the key combination you use. Or use Option-Command-R or Shift-Option-Command-R to start up from macOS Recovery over the internet. Then shut down or restart and try again.Ĭommand (⌘)-R: Start up from the built-in macOS Recovery system. If you're using Boot Camp to start up from Microsoft Windows, set Startup Disk preferences to start up from macOS instead. Some key combinations don't work when your Mac is using a firmware password. 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. 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. Guidelines for using these key combinations If you're not using a Mac with Apple silicon, you're using an Intel-based Mac. If the issue persists, follow the steps in our guide to reset the SMC. Wait for a few seconds, then press the power button again to turn on your Mac. Release the power button when you see the startup options screen, which shows your startup disks and a gear icon labeled Options.įrom this window you can start up from a different disk, start up in safe mode, use macOS Recovery, and more. Press and hold the power button for 10 seconds, then release the button. Turn on your Mac and continue to press and hold the power button as your Mac starts up. On a Mac with Apple siliconįind out if you have a Mac with Apple silicon The first form brings the system down in number minutes and the second at the absolute time specified.Īny other arguments comprise the warning message that is broadcast to users currently logged into the system.Learn about the Mac features and tools that you can access by holding down one or more keys during startup. Time is the time at which shutdown will bring the system down and may be the word now (indicating an immediate shutdown) or specify a future time in one of two formats: +number, or yymmddhhmm, where the year, month, and day may be defaulted to the current system values. OS X uses this mode automatically with supported UPSs in emergency shutdowns. Mac computers so I dont really know what to do with that. The system is halted up until the point of removing system power, but waits before removing power for 5 minutes so that an external UPS (uninterruptible power supply) can forcibly remove power.This simulates a dirty shutdown to permit a later automatic power on. code because it now() requires auth or interactive Adds user to filevault. The system is put to sleep at the specified time. The system is rebooted at the specified time. Use another wall outlet, does not change anything. Remove the samsung RAM (leaving just the Kensington ram in there) 7. remove my Kensington RAM (leaving just the samsung ram in there) 6. If -h or -r is specified, shutdown will execute halt(8) or reboot(8) instead of sending a signal to launch(8). Run disk utility, fix the disk permissions etc. If you wanted the machine to shutdown at 2:30am every day, youd enter: 30 2 /sbin/shutdown -h now. If the -o is specified, prevent the file system cache from being flushed by passing -n option to halt(8) or reboot(8).This option should probably not be used. Kick everybody off.The -k option does not actually halt the system, but leaves the system multi-user with logins disabled (for all but super-users). The system is halted at the specified time.
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