Mac Restart

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These key combinations apply only to Mac computers with an Intel processor, not Mac computers with Apple silicon.

  1. Step 3: Finding Your Mac's Reboot/Shutdown History (via Terminal) Open up Terminal again, if it's not already, and use the last reboot or last shutdown command. Just type them out one by one, then press return on your keyboard. The former logs every time your Mac was rebooted, obviously, and the latter when exactly it was shutdown.
  2. H ow do I restart Apache web server under Mac OS X operating systems? The apachectl command act as Apache HTTP Server control interface. It can be used to start, stop, and restart the Apache web server from command line.

Shutdown the computer, wait 30 seconds, restart the computer. Disconnect all third-party peripherals and remove any support software like drivers and plug-ins. Resetting your Mac’s PRAM and NVRAM; Reset the System Management Controller (SMC) Start the computer in Safe Mode, then restart normally. This is slower than a standard startup.

To use any of these key combinations, press and hold the keys immediately after pressing the power button to turn on your Mac, or after your Mac begins to restart. Keep holding until the described behavior occurs.

  • Command (⌘)-R: Start up from the built-in macOS Recovery system. Or use Option-Command-R or Shift-Option-Command-R to start up from macOS Recovery over the Internet. macOS Recovery installs different versions of macOS, depending on the key combination you use while starting up. If your Mac is using a firmware password, you're prompted to enter the password.
  • Option (⌥) or Alt: Start up to Startup Manager, which allows you to choose other available startup disks or volumes. If your Mac is using a firmware password, you're prompted to enter the password.
  • Option-Command-P-R:Reset NVRAM or PRAM. If your Mac is using a firmware password, it ignores this key combination or starts up from macOS Recovery.
  • Shift (⇧): Start up in safe mode. Disabled when using a firmware password.
  • D: Start up to the Apple Diagnostics utility. Or use Option-Dto start up to this utility over the Internet. Disabled when using a firmware password.
  • N: Start up from a NetBoot server, if your Mac supports network startup volumes. To use the default boot image on the server, hold down Option-N instead. Disabled when using a firmware password.
  • Command-S: Start up in single-user mode. Disabled in macOS Mojave or later, or when using a firmware password.
  • T: Start up in target disk mode. Disabled when using a firmware password.
  • Command-V: Start up in verbose mode. Disabled when using a firmware password.
  • Eject (⏏) or F12 or mouse button or trackpad button: Eject removable media, such as an optical disc. Disabled when using a firmware password.
Mac Restart

If a key combination doesn't work

If a key combination doesn't work at startup, one of these solutions might help:

  • Press and hold all keys in the combination together, not one at a time.
  • Shut down your Mac. Then press the power button to turn on your Mac. Then press and hold the keys as your Mac starts up.
  • Wait a few seconds before pressing the keys, to give your Mac more time to recognize the keyboard as it starts up. Some keyboards have a light that flashes briefly at startup, indicating that the keyboard is recognized and ready for use.
  • If you're using a wireless keyboard, plug it into your Mac, if possible. Or use your built-in keyboard or a wired keyboard. If you're using a keyboard made for a PC, such as a keyboard with a Windows logo, try a keyboard made for Mac.
  • 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.

Remember that some key combinations are disabled when your Mac is using a firmware password.

Learn more

  • Keyboard shortcuts that you can use after your Mac has started up.

About unexpected restarts

Finder

Rarely, your Mac might experience a software or hardware issue that requires it to restart. When it starts up again, you might see a message that your computer was restarted because of a problem.

Unexpected restarts are usually caused by software installed on your Mac, or by devices connected to your Mac. If the issue causes your Mac to restart every time it attempts to start up, your Mac might eventually shut down. Use the steps below to check the software and hardware on your Mac.

Check your software

Mac Restart

If the issue is caused by software on your Mac, one of these steps might help:

Mac restart options
  • Install all available software updates.
  • If your Mac suspects that a particular app caused the restart, it might ask whether you would like to move the app to the Trash. Click Move to Trash, then contact the software developer to see if a software update is available.
  • Use safe mode to try to isolate the cause of the issue.
  • Reinstall macOS. If the issue continues after reinstalling macOS, check your hardware.

Mac Restarting

Check your hardware

Learn how to check your connected devices and other hardware.

Check peripheral devices first

If you don't have any devices attached to your Mac, skip to the next section.

Mac Restart Finder

  1. Shut down your Mac.
  2. Disconnect all peripheral devices, such as hard drives or printers. If you have a desktop Mac, make sure that only a display, keyboard, and mouse or trackpad are connected.
  3. Turn on your Mac.
  4. Use your Mac for the amount of time that it would usually take for an unexpected restart to occur.
  5. If an unexpected restart occurs, follow the steps to check the internal RAM and third-party hardware.
  6. If an unexpected restart doesn't occur, turn off the Mac and connect one peripheral device at a time until an unexpected restart occurs.

Mac Restart Fpm

Check RAM and third-party hardware

Mac Restart

Certain models of Mac computers have removable memory (RAM). If you recently installed memory or a hard disk (or SSD), make sure that it's compatible and installed correctly. If possible, remove it and test with the original memory or disk.

Learn more

Mac Restart Keys

  • If you continue to experience unexpected restarts, contact Apple Support.
  • If your Mac is frequently restarting unexpectedly, it's important to determine the exact steps that lead up to the issue. The next time that your Mac restarts unexpectedly, record the date and time it occurs. These questions might help you diagnose the problem:
    • Was the computer starting up, shutting down, or performing a particular task when the unexpected restart happened?
    • Is the computer restart random, or does it happen every time you do a certain task?
    • Does the restart happen when a specific external device is connected to your Mac or to a specific port?
  • Learn what to do if your Mac doesn't turn on or start up.
  • Learn about the screens you see when your Mac starts up.