The other day when I was using my Macbook Pro, it all of a sudden froze up on me. As in many cases when computers act up, I tried turning it off and on again. Unfortunately each time I tried to boot, the progress bar would make it 3/4’s of the way across the screen and then the power would go off. Since it had been a couple weeks since I last backed up my files, I was worried that I was going to lose some of my recent coding progress. That’s when I found to about single user mode built into OS X.
Launch into Safe Mode
Load the following system libraries
Start the networking