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It's very weird and, to me, inexplicable. But I'm relieved it was somehow a macOS bug. Literally saves me $2500, not being in a rush to buy a new desktop now.

And now on 11.6 and my iMac is back to behaving correctly. Updates, reboots, everything is normal. There was a bad USB port, Ihaven't checked to see if it's working again. I don't know what went wrong with macOS on my iMac back in 2020, but thankfully it's fixed and the computer remains normal. :)

After that 11.1 to 11.4 update, my iMac has seemingly been booting normally. I had to turn off the power yesterday (for some DIY home improvement), ran the latest Apple update, and my iMac updated and rebooted normally, and then again booted up after my power outage. I have no idea how or why...

Not sure it’s sorted :) but got a very helpful reprieve.

I’ve stopped running macOS updates the past 3 or 6 months. But I’ve got some issues accrued, I’m behind on security updates, and really need to reboot my machine. So I updated from 11.1 to 11.4 this morning. And remarkably my iMac updated successfully! No crash and hang at the reboot! I left it...

I turned off sleep and it no longer suffers the problem. But I never found the root cause problem.

Unrelated to crashing but related to frustrating performance problems, maybe I just fixed a Spotlight issue that's been bugging me: https://www.computerworld.com/article/2731740/turn-off-indexing-by-spotlight-for-external-drives.html I use Spotlight as an app launcher and lately it takes 10 to...

As I did when I quite Microsoft / Windows circa 2007 when it became too boring, too burdensome, too not what I wanted anymore, I’ll quick Apple / Mac when it’s more pain than pleasure. But the totality of the solution outweighs a single bad machine. Do you not use multiple devices, or software...

Yes, this my iMac should be having none of these problems at 3-4 years old. That was always part of the Apple (implicit) promise: good hardware that lasts. I don’t I know if that’s changed. Aside from the keyboard fiasco, I’m not hearing about these sorts of failures as common problem. Someone’s...

It's a bummer a very expensive computer is dying relatively young. My 2007 MacBook pro lasted 7-some years. My wife's 2015 (?) iMac is going strong (to be upgraded this year). Why is my seemingly dying after 3 or 4 years? Wish I knew. But "comparable" is a funny word for shopping these days...

My iMac seems to have had one of its 4 USB ports die. I will be replacing it this year. This is very weird, early-life death for a Mac. Not happy about this degree of hardware problems on a $2500 desktop that's gently used. :(

I’m anxiously awaiting new M1 iMacs. I’m not updating or rebooting my iMac, at this point. I need new computers available so I can have the freedom to risk rebooting, knowing I can buy a replacement if my current iMac dies completely.

I think I mutter that every time!

Foolishly rebooted this morning -- trying to get iCloud tabs back alive after dealing with a minor Messages catastrophe of my own stupid making. And it won't reboot, even with repeated PRAM zapping attempts. Long story short. Shut off iMac for a couple hours, unplugged all peripherals...

iCloud Tabs weren't appearing in Safari, so logged out. Rebooting sometimes fixes the iClouds tab problem. But given recent problems with booting, I thought log out and log in would be faster and safer. Nope. System hung on Log in. Did a force off and tried to zap PRAM. Hung. Did a force off...

iMac was self-rebooted from system crash today. Have upgraded to Big Sur since last round of crashes. This is a time marker to gauge dap between crashes, if it happens again.

I mis-spoke. It's a 2017 iMac. So, no warranty. Having zapped the PRAM and gotten things back to working again, I'm cautiously optimistic that I'm good for a while longer. I'm hoping this PRAM weirdness is the root of the problems I had previously, paritcularly with this Summer's Catalina and...

2019 iMac.

Trying to figure out what if anything to do to be ready in case iMac is near death -- hopefully PRAM was problem that past year, but ??? My main "gap" is SuperDuper isn't BigSur compatible yet so my SD clone is stuck on Catalina, right before BigSur upgrade. Thinking of swtiching to CCC and...

Well, shit. I finally reset the PPRAM and it booted up.

Can’t boot from my SuperDuper backup from Catalina. iMac might be totally dead. :(

iCloud tabs weren’t syncing so reboot my iMac to trying and get it fixed. my iMac hasnt been able to restart since. It’s crashing and hanging again on boot. I’ve gone into the Command-R recovery system, and am trying to reinstall Big Sur for the second time. this just sucks

Yeah, I was preparing to spend the day restoring from backup. And that is why I left it alone overnight — that and having learned not to jump into computer problems end of day when I’m exhausted. :) I think the upgrade proceeded correctly, but the status screen was locked. A weird situation...

All’s well that ends well :) I did a hard reboot, and basically it came back fine. The upgrade was successful despite having frozen on the progress screen. And no crashes so far today since.

I spoke too soon, kinda. My iMac has seemingly crashed in the middle of the latest OS update. I’m leaving it until tomorrow. Maybe magic elves will fix it while I sleep.

Nearly two weeks and no crashes. Installing macOS update, so I’m resetting the dats-since-crash.

It's been a week and no crashes. Looking like that basic sleep feature was the problem. <whew>

Good catch. I've got an internal SSD and two external hard drives. I'll leave the settings for now. If I get another crash, I'll toggle that one and see what happens.

Disabled Sleep and reboted yesterday (i think this is the way to do it. It's like a double-negative checkbox instead of a clearer enable or disable sleep option.) Will see how this goes.

It didn't crash last night or today, which surprised me but is good. It's not crashing every single sleep. That's an option. This weekend, I'll do another iteration of diagnostics. I guess I should disable sleep next and give it a week. That's no impact to my life and no risk (however small for...