Does "Single User Mode" still work, post v10.10.x ?
I tried the following instructions, without success:

OS X Yosemite: Start up in single-user mode

To troubleshoot your computer’s startup sequence using only UNIX commands, start up in single-user mode. You should do this only if you’re comfortable with UNIX.

Choose  Apple menu > Restart, or press the power button if your Mac is turned off.

Press ⌘ command+s as your Mac starts up.

The screen is black with standard white text. You can now run the UNIX commands that you want.

In single-user mode, not all OS X functions are available. To use the standard OS X interface or other high-level aspects of OS X, you need to start up in the standard mode.

To switch back to the standard OS X interface, type reboot, then press return ⏎.

I just get the regular GUI login screen.
Any idea what's causing this (and/or) how to rectify?

  • Have you set a firmware password on your Mac? – Gordon Davisson Dec 25 '15 at 6:17
  • @GordonDavisson Quite possibly. – tjt263 Dec 25 '15 at 12:43
  • If you have a firmware password, I don't think there's any way to invoke single-user mode (except removing the firmware password first). You can check by starting with the Option key down, and see if it prompts for the password. – Gordon Davisson Dec 25 '15 at 19:22

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