Apple Mac – Boot-time key combos (aka magic incantations that hide the PC underneath)   Leave a comment

Quick n nasty c’n’p tbc

 

Start up your Mac in single-user mode or verbose mode

If you’re an advanced user who is comfortable with UNIX, you can use single-user mode or verbose mode to help isolate issues related to startup.

Single-user mode

  1. Turn on your Mac, then immediately press and hold Command-R to start up from macOS Recovery.
  2. Select Disk Utility from the Utilities window, then click Continue.
  3. From Disk Utility sidebar, select the volume that you’re using, then choose File > Mount from the menu bar. (If the volume is already mounted, this option is dimmed.) Then enter administrator pwd when prompted.
  4. Quit Disk Utility.
  5. Choose Terminal from the Utilities menu in the menu bar.
  6. You can now enter UNIX commands. When done, choose Apple () menu > Restart.
These steps replace the Command-S method, which doesn’t work with the recommended settings on current Mac computers.

Verbose mode

  1. Turn on your Mac, then immediately press and hold Command-V.
  2. Continue holding the keys until you see white text on the screen.
    • If you’re using FileVault, release the keys when you see the login window. Then log in to continue starting up in verbose mode.
    • If you’re using a firmware password, you must turn off the password before you can start up in verbose mode.
  3. You can now enter UNIX commands. To exit this mode and start up normally, type reboot, then press Return.
How to use Apple Hardware Test
  1. Disconnect all external devices except keyboard, mouse, display, Ethernet connection (if applicable), and connection to AC power. AHT might display an error message if you don’t disconnect all other devices.
  2. Make sure that your Mac is on a hard, flat, stable, well-ventilated work surface.
  3. Shut down your Mac.
  4. Turn on your Mac, then immediately press and hold the D key on your keyboard. Keep holding the D key until you see the Apple Hardware Test icon:================
  5. Select your language and click the right arrow. If you aren’t using a mouse, you can use the up and down arrows to select a language, then press the Return key.
  6. To begin testing, click the Test button, press T, or press Return. Optionally select “Perform extended testing” before beginning the test. This performs a more thorough test that takes longer to complete.
  7. When the test is complete, review your test results in the lower-right section of the window.
  8. To quit Apple Hardware Test, click Restart or Shut Down at the bottom of the window.

Posted July 4, 2020 by benryanau in Apple and Mac, Hacking, ICT

Tagged with , , , , , , , , ,

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