Extensive listing of places to find key information such as your User UUID/GUID, Ethernet MAC, model identifier, and much more.
hardware
When you replace the internal disk fitted by Apple, some Macs seem to stop installing EFI firmware updates. Is there anything to be done?
What should you do when you try to restart in Diagnostics Mode and can’t? And how to check and restore a Recovery partition.
Apple’s latest Macs have T2 chips and SSDs which are not user-replaceable. Isn’t buying one courting with disaster?
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.
Should you worry about Apple and all those UUIDs? Some claim that they are being used to track you and what you do on your iPhone and Mac.
SSD or hard disk? Western Digital, HGST or Seagate? Multiple smaller capacities, or one big disk?
Shutdown cause codes, wake reasons, ACPI, and sleep states – diagnosing problems from hardware events.
A starting point for diagnosing and fixing your Mac problems, with links to key articles here.
How to interpret the code numbers written into your Mac’s log to indicate the reason for shutting down, restarting, or going to sleep.
