I was replying to a tweet when the display suddenly went black. Was my iMac Pro dead, or just auto-rebooting after a kernel panic, and why?
kernel panic
What to do when your Mac won’t boot into the Desktop and Finder – another summary diagram for diagnosis and suggested solutions.
Can you tell the difference? What is the significance of each, and do you know what to do about them? An introductory guide.
From 10.8 onwards, you will not see the classic grey display, but your Mac will spontaneously restart or shut down. Here are the details, and what to do next.
The release of Sierra seems to have gone smoothly. Was it really a major release, though? What does it get wrong? What about third party support?
After a near-panic and interminable spin, it proved impossible to get useful diagnostic information. Here are some tools and techniques which should still be useful.
Sometimes you can’t use the menu command, or it doesn’t work. What do you try next?
Handling of kernel panics shows a series of fundamental flaws in El Capitan, which can occur on any Mac.
Does El Capitan suffer the most evil bug of all, which suppresses the normal kernel panic process?
Was that crash a freeze, a panic, or just a spinning beachball? And what do they mean?
The Eclectic Light Company 