Just in case you're the one person on the Internet who hasn't read this:
Not a single living person knows how everything in your five-year-old MacBook actually works. Why do we tell you to turn it off and on again? Because we don't have the slightest clue what's wrong with it, and it's really easy to induce coma in computers and have their built-in team of automatic doctors try to figure it out for us.
Perfect.