This key doesnt work with some older Macs or clones that didnt use Apple CD-ROM drives they require Command- Shift-Option-Delete instead (see below). Start up from an OS X startup volume when the Mac would otherwise start up from a non-OS X startup volume.Įject (⏏), F12, mouse button, or trackpad buttonĮject removable media, such as an optical disc. The C key forces the Mac to start up from a bootable CD-ROM, if one is present, which is useful if something goes wrong with your startup hard disk.
Release the keys after you hear the startup sound again. Start up from OS X Recovery over the Internet. Start up from a NetBoot server using the default boot image. If you press and hold the Shift key during.
Mac startup keys diagnostics mac os x#
Start up from a compatible NetBoot server. Here’s a handy key sequence to know if you need to troubleshoot Mac OS X problems or problems with apps on your Mac. Click on the disk you want to turn into the default boot disk, press and hold the Option key, then click Always Use. You’ll be back at the Startup Options screen. Start up to either Apple Hardware Test or Apple Diagnostics over the Internet. From a shut down M1 Mac, press and hold the Power button until Loading Startup Options appears, then release the button.
Which method you will want to use depends on your Mac model, but the OPTION trick works on every Mac. Start up to either Apple Hardware Test or Apple Diagnostics, depending on which Mac you’re using. 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.
Mac startup keys diagnostics install#
Start up from a bootable CD, DVD, or USB thumb drive (such as OS X install media). Release when you see the startup options window, which includes a gear icon labeled Options. These combinations work with Intel-based Mac computers. Start Apple Diagnostics Determine whether you're using a Mac with Apple silicon, then follow the appropriate steps: Apple silicon Turn on your Mac and continue to press and hold the power button as your Mac starts up. Keep holding until the described behavior occurs.
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.