If your Intel-based Mac computer displays a blank or blue startup screen, or a question mark on the startup screen, there may be a problem with firmware updates ...
Nov 8, 2023 · Unexpected restarts are usually caused by software installed on your Mac, or by devices connected to your Mac. If the issue causes your Mac to ...
To get going, hold down Command, Option (Alt), P, and R, keys at once and turn on the device. Make sure to hold down the keys until the MacBook restarts again.