My Macbook Pro (2011) won't boot into single user mode
You may considering using these steps to start up your Mac in single-user mode or verbose mode:


Shut down your Mac.
Press the power button to start up your Mac.
Immediately hold down the following keys:


Hold down Command-S for single-user mode.
Hold down Command-V for verbose mode.

You've successfully entered single-user mode or verbose mode when you see white text appear on the screen.


Hope it works.