Not all these functions work with every version of Mac OS X or with every hardware upgrade, but they are the most common. Force eject (CD/DVD): Click Mouse Button and Hold.Boot to open firmware: Command + Option + O + F.If the installer doesn't see your disk, or it says that it. Follow these guidelines during installation: If the installer asks to unlock your disk, enter the password you use to log in to your Mac. Reset PRAM: Command + Option + P + R (Note: Hold until second chime) To begin installation, select Reinstall macOS from the utilities window in macOS Recovery, then click Continue and follow the onscreen instructions.Target disk mode: T (Note: Only for FireWire Macs).

Safe-boot mode: Shift (Note: Disables nonessential and login applications).Boot to external hard drive: Command + Option + Shift + Delete.The following key combinations can be held as your Mac is powering on: While you cannot run any code from Terminal or otherwise to set an order of boot devices, you can easily control where your Mac boots via keyboard commands. The following is a more comprehensive list of the keyboard commands you know and many you may not.Ī recent tweet from reminded me of several boot commands I've learned over the years, so I thought a more comprehensive list would be useful for MacFixIt readers. On July 1, 2011, Apple released Mac OS X 10.7 Lion to the public. Many users are aware of some boot commands for Mac OS X that provide different functionality for your system. If your Mac wont boot into Recovery Mode or Command-R not working, do you know how to.

Option + r mac os x