- You grab your Mac OS X CD or DVD, insert it, press the reset button, hold down the 'C' key and expect to be back up and running - but the system still refuses to properly boot.
- A Mac can start up from any disk that contains a bootable operating system or the files necessary to run your computer while you install an operating system. Whether you're starting up your Macintosh computer from its internal hard drive, an operating system installation disc or an external drive, it's easy to get your computer going.
Reasons for Mac Boot from USB: Booting the Mac from USB in a way gives the power back to the user. The likeliest of the reason for choosing the boot from the USB method is that your Mac won’t start which denies the user access to the computer. Using an external source like the USB drive helps the user get around the problem.
Sp flash tool for mac os x. 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.
If a key combination doesn't work
What Is A Startup Disc On Macbook Air
If a key combination doesn't work at startup, one of these these solutions might help:
- Be sure to 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
- Learn what to do if your Mac doesn't turn on.
- Learn about Mac keyboard shortcuts that you can use after your Mac has started up.
What Is A Startup Disc On Mac Computer
Welcome to Apple Discussions,
Insert the Mac OS Install disk and then go to Apple > System Preferences > Startup Disk and choose the desired disk and click restart.
or
Insert the disk and boot while holding the C key on the keyboard until you see the Apple logo with a spinning gear. Then wait until the system boots (can take a bit longer than normal as you are booting from optical media which is slower than a hard drive)
or
Boot while holding the option key to access the startup manager. Insert the install disk and then wait for it to be recognized or click on the circular arrow to check for bootable media. Click on the CD icon to boot from CD.
Hope that helps.
Insert the Mac OS Install disk and then go to Apple > System Preferences > Startup Disk and choose the desired disk and click restart.
or
Insert the disk and boot while holding the C key on the keyboard until you see the Apple logo with a spinning gear. Then wait until the system boots (can take a bit longer than normal as you are booting from optical media which is slower than a hard drive)
or
Boot while holding the option key to access the startup manager. Insert the install disk and then wait for it to be recognized or click on the circular arrow to check for bootable media. Click on the CD icon to boot from CD.
Hope that helps.
What Is A Boot Disk For Computer
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