Visualizing the Mac Startup Process: What Happens When a Mac Boots?
Have you ever wanted to know what’s going on when you startup a modern Mac? You press the power button, you see an Apple logo, and the Mac boots up into MacOS… from the average user perspective it’s about that simple, right? But what is actually happening behind the scenes after you press that power button and you’re booting macOS?
That hidden technical side of the Mac booting process is what an excellent visual diagram from Howard Oakey at EclecticLight helps to demonstrate.

















