Shulou(Shulou.com)06/03 Report--

To enter a specific startup mode, to enter any specific mode using any of the following key combinations, you first need to use the power button to turn on Mac, and then press the desired key combination immediately. This editor brings you a summary of macOS startup mode, come and have a look!

Summary introduction of macOS Startup Mode

Recovery model

Through the recovery model, you can access the terminal, repair the disk using disk tools, and reinstall macOS using the recovery mode, which is located on a separate partition of the hard drive. To enter recovery mode, press Cmd + R at startup.

Select Boot disk

If you want to select a boot disk or boot from a portable USB, press Option at startup.

Apple hardware testing / Apple Diagnostics

Depending on the version of Mac, you can access the Apple hardware test or diagnostic test to detect any possible problems with the hardware. To access it, press D at startup.

Safety mode

In safe mode, you can check for errors in the boot disk and fix them accordingly. This mode will prevent all startup / login entries from loading and will also clear the system cache. To start Mac in safe mode, simply press the Shift startup key.

Target disk mode

With the target disk mode, you can easily copy files from one Mac hard drive to another. Once in target disk mode, simply connect your Mac to another Mac using the appropriate cable, and then transfer the files to another hard drive. To enter target disk mode, press T at startup.

Single-user mode boots Mac into a basic environment with a Unix prompt where you can type commands. For advanced users who can try to resolve problems that Mac cannot start. There is no GUI or drive installed when booting in single-user mode. To enter single-user mode, press Cmd + S at startup.

Detailed mode

If Mac hangs at startup, you can use detailed Mode to see what went wrong during startup and what caused it to hang. To start verbose mode, press Cmd + V at startup.

Network mode

If there is a client computer on the network image, you can use the NetBoot service to customize the macOS and create custom images for specific users. This will allow you to deploy images across the network without having to modify each computer individually. To boot to Netboot, press N at startup.

Reset SMC

Apple Macs has a SMC chip (system management controller chip), which can control a variety of hardware tasks, such as fan speed, power management, etc. To reset SMC, press Shift + Control + Option at startup.

Boot from CD (CD / DVD)

If you have an older Mac with an optical drive, you can choose to boot from the CD / DVD that contains the installation media, and press C at startup.

Eject CD

To eject a disc that may be stuck in the Mac, press the F12 eject button or the mouse / touchpad button at startup until the disc is ejected.

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