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Release the keys after you hear the startup sound again. Start up from OS X Recovery over the Internet. C boot from CD - gone are the CD-Rom days though:) T To boot in target disk mode. Make sure you keep holding the keys until you see the described behavior. Start up from a NetBoot server using the default boot image. You need to press and hold these key combinations immediately after you press the power, you can use them even after your Mac reboots. Whatever your needs, you can boot your Mac in a variety of modes to complete a task before startup all you need to do is press some keys down and wait. Sometimes you need to boot in Recovery Mode to reinstall an OS or recover your hard drive via the internet. Start up from a compatible NetBoot server. Sometimes your Mac isn't running correctly, so you need to reset the NVRAM and PRAM. Start up to either Apple Hardware Test or Apple Diagnostics over the Internet. Start up to either Apple Hardware Test or Apple Diagnostics, depending on which Mac you’re using.

#Mac startup keys diagnostics install#

Start up from a bootable CD, DVD, or USB thumb drive (such as OS X install media).

To start up to either Apple Hardware Test or Apple Diagnostics, press D or Option ()D after the startup chime, depending on which Mac you’re using.

Which method you will want to use depends on your Mac model, but the OPTION trick works on every Mac. These diagnostic modes run a barrage of tests to determine the overall health of your Mac and identify any potential underlying issues with its hardware. These combinations work with Intel-based Mac computers. There are two ways to reach Recovery mode on a Mac: Hold down the OPTION key during boot and choose the Recovery option, or Hold down Command+R keys during boot to access the Recovery HD partition. Keep holding until the described behavior occurs. Release the power button when you see the startup. Turn on your Mac and continue to press and hold the power button as your Mac starts up. You can use these alternative startup and diagnostic modes to.

#Mac startup keys diagnostics how to#

Some Mac features are available by holding down certain keys during startup.Press and hold the keys immediately after you turn on your Mac and hear the startup sound. How to Use Apple Diagnostics on an Apple silicon Mac. Your Mac firmware supports many keyboard shortcuts, and when you use.