I tried to update my personal macbook, and it almost bricked it. (Took about 4 hours to recover because it kept booting up with a white disabled icon.) I updat

I tried to update my personal macbook, and it almost bricked it. (Took about 4 hours to recover because it kept booting up with a white disabled icon.) I updated my work macbook and it worked fine. Can't explain that. That said, I don't really see any material improvements, so...