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Okay, after *some* troubleshooting, I’ve figured out my Mac Pro will not boot with either external 4-bay Thunderbolt RAID drives (Akitio or OWC) plugged in. Boots fine and super fast without.

Boots fine with an external 4TB M.2 single drive enclosure or my OWC Thunderbolt 3 Doc.

So… any thoughts?

Mac Pro 2019, 96GB ram, 1TB internal, AMD Radeon Pro W5700X 16GB, internal OWC 4 slot M.2 PCI card with 8TB RAID0.

External drives: Akitio 4-bay with 24TB 4x6TB HDD RAID0, OWC Thunderbay 4 with 2x16TB HDD 32TB RAID0 and 2x12TB 24TB RAID0. (These externals stop boot if either or both are turned on.)

Just tried updating 2019 Mac Pro from MacOS Sequoia 15.1 to 15.2 and it failed showing a circle with a line through it. Went to link provided - If your Mac starts up to a circle with a line through it - Apple Support

“A prohibitory symbol, which looks like a circle with a line or slash through it, means that your startup disk contains a Mac operating system, but it's not a version or build of macOS that your Mac can use.”

Reinstalled from recovery, no good. Mac Pro now stops mid boot at about 50%. Ugh!

Posted on Apple Support forums.

Your rather lame criticism of Apple’s clever, informative and humorous piece, “Mother Nature”, sadly and predictably shares none of those qualities.

In the future, try to remember to point your rocket skyward before igniting your engines. At least you might gain some altitude before ploughing useless into the mud. Again.

Sympathies on your decent into mediocrity.