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?