Shift : Start your Mac in Safe Mode.
Since safe mode only loads essential software, you can determine whether a system process or a user-installed application is causing your problem. Option : Boot into Startup Manager. From here you can select different startup disks if any bootable partitions are available. You can use it to reinstall macOS, restore from a Time Machine backup or use Disk Utility to repair or format your hard drive.
This allows you to reinstall the build of macOS that came with your computer from the factory.
macOS Boot Options
This mode displays logging and diagnostic messages as your Mac boots. If your Mac is showing the Apple logo but failing to start completely, try this step to see where in the boot process the error occurs. Then release the keys after about twenty seconds. During the reset process it might seem like your Mac is restarting before starting up normally.
How to reinstall macOS, even without Recovery Mode
The SMC, or System Management Controller, is responsible for low-level hardware functionality like fan speed, battery charging and sleep routines. To perform the reset, hold down the Shift , Control and Option keys on the left side of the built-in keyboard, then press the power button at the same time. Hold the modifier keys and power button down for ten seconds, then release all the keys and start the computer normally. For Apple desktops you can reset the SMC by disconnecting the power cable and all peripherals for fifteen seconds.
T : Start up in Target Disk mode. This command makes the computer it was executed on behave like a hard drive, allowing you to pull data off of it with another Mac.
You should also be using a USB keyboard plugged into your Mac. This is the nerdier of these options. It lets you choose a startup disk.
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Perhaps you have a Mac with two drives inside, or you have a backup stored on an external USB drive and you want to start up from that. In those cases, use the Startup Manager. Instead, you just hold down C when you start up, and keep it held down.
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If there is a connected disk optical or USB that contains a valid macOS installation, then your Mac will start from that instead of from its usual internal drive. Recovery mode lets you rescue a dead Mac by reinstalling macOS , either from a local source or from the internet. After starting up with the Command-R combo held down, you will see your recovery options. Command-R will reinstall whatever version of macOS was on your Mac before it died.
How to Restore your Mac Operating System | PowerMax
But if you hold down. You can also hold down Option-Command-R to upgrade to the latest version of macOS that will work with your Mac, or Shift-Option-Command-R to go in the other direction, and install the version that came with your Mac when it was new. My favorite aspect of this option is that — if you have a good, fast internet connection — it can actually be faster to reinstall from the internet than to reinstall from a DVD. Target Disk Mode is simple.
If you start up with the T key held down, your Mac becomes a giant storage disk which can be plugged into another computer, just as if it were thumb drive. It will show up as a connected disk, and files will copy across at full speed, instead of slow Wi-Fi network speeds.
If you still use a Mac with a DVD drive, then this startup trick will force the tray to open as you boot.