macOS sequoia 15.2 update Mac Pro 2019 failed

15.3 seems to cure these ills.

I had it hang once when I tried to restart hoping that would load the drives but had to force restart with power button, booted fine the 3x after that happened with the Thunderbay on. No drives loaded. Just found out my iPhone wont connect to Mac Pro...this must be a Mac OS 15.2 bug.

After longer use I've discovered that any drives connected to thunderbolt causes my fans to spin like turbines after a little while. This happens even WITHOUT the thunderbay 4 turned on/connected. I use a Samsung T9 for backup and a simple copy of a few hundred mbs takes forever which before the update took seconds to do maybe less. I think having the thunderbay 4 connected and turned while doing the OS update might have caused this issue?? Now I'm dreading to have to do an erase and re-install of everything.

I can wholeheartedly recommend the "upgrade" back to Sonoma.

When I installed Final Cut Pro 11 on Sequoia (15.1) I had massive problems with rendering. Basically, both Final Cut and Compressor were very unstable and rarely completed rendering in the first go. Even worse, they occasionally disconnect my render drives (guess what - those drives were connected via thunderbolt 4...). In such a case, I needed to reboot the whole computer and render again.

Now back on Sonoma, Final Cut Pro 11 works like a charm. Zero problems.

One little hack I've discovered that's letting me stay on Sequoia even with this epic hassle:

As you know, with Sequoia 15.2 you can't restart/boot-up your Intel Mac with peripherals plugged in or it won't finish starting up. However, I've discovered that...

If you plug your peripherals back in (USB Hubs and/or Thunderbolt devices) just before you type in your password, then the Mac will mount the devices (once you've logged in).

Would love to know if anyone's taken the time to call into Apple Support to flag this as a serious problem. (Of course, the answer is likely "Buy an M-based Mac" I would expect.

This is nothing short of a scandal! I am a loyal Apple customer and use many Apple products. (from a Mac Pro to an Apple watch and everything in between). ****, I even own Apple stock!

My 2019 Mac Pro was doing just fine until, you guessed it…15.2…..!?

I use this machine as the heart of a recording studio. Just like everyone else in this thread…can’t use TB peripherals….won’t boot until they’re disconnected. I took it to Apple! They reinstalled Sequoia and it worked until I took it home and hooked up my peripherals. You know the rest. I’m disgusted.

Come on Apple!

This exact issue is still happening on 15.2 (24C101) - why have they not fixed this? It's awful.

Do they even monitor these discussion or do we have to pay to report issues with their software?

If it's a beta, all bets are off :-)

What ever you do don;t go the route I tried of not release versions 15.3 does not fix this.

Definitely cured on mine, but I did have to power cycle boot a couple times to get to my SATA-connected internal Sonnet HD cage drives.

My 2019 MP took the update, but devices (keyboard, mouse, external RAID) connected via Thunderbolt adapters are not recognized after initial Filevault unlock. USB-A keyboard connected via adapter works for the initial password entry at bootup but not at the login screen. Same keyboard/mouse works fine if directly connected to a USB-A rear panel port. This affects Apple TB2 to TB3 and Lightning to TB3 (iPhone) adapters and 3rd party USB-A to TB3 adapters connected to any of the Mac rear panel TB ports or XDR display TB ports. System Report says no Thunderbolt drivers loaded. Attempts to re-install via recovery unsuccessful so far. Install does not seem to complete.

Just want to follow up...I did some troubleshooting and found that when my OWC thunderbay (thunderbolt 3) plugged in and turned on at boot, the thunderbay drives DO NOT load. When I turn off the thunderbay and reboot then turn on the thunderbay all of the drives load normal. Might be a OS glitch?

For people investigating this issue please confirm specific device models and connection type eg OWC ThunderBay 6 / Thunderbolt 3

For drive enclosures please confirm if still failing to boot even with an empty enclosure. eg empty OWC ThunderBay 6 / Thunderbolt 3 with no drives