The Mac has completed its self-test routines, and now prepares to load the EFI firmware or ‘boot loader’. Where it finds it, what it needs, and how Secure Boot changes this.
SMC
What happens in your Mac when you press the Power button? Before it loads the EFI firmware, it goes through self-testing, and initialising key chips.
By default, your Mac’s cooling fans run at full blast. Only the control system slows them down when it is safe to do so. How to diagnose and fix its problems.
All about firmware, the SMC, NVRAM, and the new T2 chips which come in some models of Mac. When and how to reset, and more.
When should you reset your SMC and NVRAM, repair permissions, install a Combo update, or re-install the whole of macOS?
Effectively a Combo updater with the Supplemental Update, many apps are updated in a total payload of around 4.5 GB. And there’s the new emoji too.
As usual, Apple’s release notes for the Supplemental Update to High Sierra, released on 5 October 2017, fall […]
How to update your firmware, reset the SMC, and reset the NVRAM (or zap the PRAM), and what they do. Updated for High Sierra.
Safe mode, or Recovery? Which type of Recovery? How to engage all those useful modes at startup, and when shutting down.
Shutdown cause codes, wake reasons, ACPI, and sleep states – diagnosing problems from hardware events.
The Eclectic Light Company 