Diagnostic, Recovery, Safe, Startup Manager, Verbose, reset SMC/NVRAM, firmware restore, Target Disk/Display, Single-User (SUM) in outline.
diagnostics
How to check your Mac’s hardware, interpret the results, deal with problems, and tackle tricky intermittent faults.
From hardware diagnostics to pmset and resetting the SMC, all you need to know about diagnosing wake and sleep problems.
Had my Mac frozen, or was it just very busy running tests on the boot disk? When I forced it to restart, what did the log reveal?
What should you do when you try to restart in Diagnostics Mode and can’t? And how to check and restore a Recovery partition.
More friendly, it runs checks in the background as much as possible, and has improvements in displaying results.
When should you reset your SMC and NVRAM, repair permissions, install a Combo update, or re-install the whole of macOS?
Did you know your Mac may keep a history of its activities going back for over 3 months? Here’s how to access it, and some surprising results.
Even if you don’t connect it, a Mac’s Ethernet port is vital to authorise it to the App Store and more. Here’s how to cope if it goes missing.
Sierra’s logs have changed, and now contain full entries for around 20 days. There’s also a log log, which has statistical summaries. All useful information for diagnosis and forensics.
The Eclectic Light Company 