Power-on self-tests (POST) are widely used in electronics, and one of the oldest features of personal computers. Every model of Mac in the past has had its own POST routines, some that have become famous because of the sounds that result, or what’s displayed, from the sight of a Sad Mac to the sound of a car crash. So what happens when an Apple silicon Mac fails its POST? Does it even run them?
I never stopped to think about this. The answer is interesting in that it’s not definitive.
