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010001111354615dHave you checked the logs when booting in verbose mode?
Apart from knowing not a whit of what the verbose messages are up to, and the fact that they’re spilling out at a rapid and undocument-able rate in microscopic 2 point font, the part it seems most stuck on is
“tx_flush:1028: xid 1560939 tx stats: # 20 finish 21 enter 393 wait 0 0us close 0us flush 186753us”
Which shows zero useful results in Google.
It just now repeated mostly like the above but with differing numbers.
Here’s a partial photo.
Have you tried booting from a Time Machine backup?
Can you get anywhere holding these key commands during a reboot?
Startup Manager: Option (⌥)
Single-User Mode: Command (⌘)—S.
Target Disk Mode: T.
Verbose Mode: Command (⌘)—V.
Safe Mode: Shift (⇧)
Recovery OS: Command (⌘)—R.
What I ended up doing was what I’d been avoiding because I hate hate hate talking to tech support reps. I called tech support. It took over an hour but she walked me through a more exacting sequence of magical keyboard/restart incantations which finally ended up in reinstalling the OS completely. Now I’m working on installing the OS to a fast external SSD for better performance. That’s also not working because the installer claims the SSD is “locked”. Macs are so easy to use!!! ;)
dontbeevil443914dBut but mac just works
stackodev974114dI finally got it working and holy crap this thing is fast now. that external SSD as startup disk trick really works! like a whole new Mac that I can actually enjoy using for my music recording and other off-work stuff.