Click on the Apple menu and select Shutdown.You’ll be returned to the OS X Utilities window.Click on the Terminal menu and select Quit Terminal.When the erase procedure eventually finishes, type exit in the Terminal window.A process window, like the one below will be displayed in Terminal. Sit back and wait many hours for the hard drive to be securely erased.Listed below are the various Levels permitted, from 0 to 4. Important Note: For a detailed explanation of this command read this article at OS X Daily about erasing free space from the command line. Type diskutil secureErase freespace 2 /Volumes/Macintosh HD (or replace Macintosh HD with the precise name of your Mac’s hard drive or replace 2 with another “Level”, see guide below) and then press the Return key.Only proceed if you’re comfortable using Terminal. One small typo could lead to the unintended loss of data or lose. At the dell splash screen tap F12 Continuously until the one time boot menu appears Using.
Then push the power button on my Mac Pro Mid 2010 and the immediatley hold down the 'option' key on my keyboard while it was. One way I was able to fix it and at least get back to the Yosemite operating system was to shut down completely.
Issuing commands requires precision and is unforgiving. Yosemite and tried to update to Sierra and also got stuck on macOS utilities screen. Click Continue, then follow the onscreen instructions. Be careful when issuing commands from the Terminal. Choose Reinstall macOS (or Reinstall OS X) from the utilities window.
You’ll be asked if you’re sure you want to erase it.In the right pane of the Disk Utility window, click the Erase tab.In the left pane of the Disk Utility window, click on Macintosh HD (which is your laptop’s internal hard drive).Click on the Disk Utility option from the “OS X Utilities” window.Give your Mac a couple of minutes to startup, at which point you’ll see a window like the one this one.Once you see the Apple logo appear in the middle of the screen you can release the Command and R keys.This instructs the computer to startup from the Recovery Partition. I've tried using Repair and Verify on them, but they all turn out to be okay, then if i try the Reinstallation, the same thing happens, it just returns me to the OS X Utilities screen after it finishes its hour long install. Turn on the laptop and immediately press and hold down both the Command key and the R key.