1. I was getting BSODs even as the HP self diagnostics were coming clean.
(I tried all the repair options for days, but nothing worked.)
2. So I formatted the HDD & installed Windows 10 Pro perfectly clean.
Everything works fine for about an hour or so... and then BSOD!
3. They're not even the same BSOD, so I "think" it's the PC hardware.
But what?
4. Which hardware could it be (the HP diagnostics all report clean).
CPU, memory, motherboard ... HP diagnostics report all are clean.

Windows runs for an hour or so and then turns blue with a variety of BSODs,
where this is just the _latest_ sequence of BSODs after about an hour.
a. Memory management
b. System service exception
c. Kernel security check failure
d. Unexpected kernel mode trap

Here's a sequence, in order, of BSODs and reboots from today to help out:
https://i.postimg.cc/9Q4m7tfM/bsod01.jpg
https://i.postimg.cc/DyNFnJcK/bsod02.jpg
https://i.postimg.cc/zGRNBzdH/bsod03.jpg
https://i.postimg.cc/9McHJGcy/bsod04.jpg
https://i.postimg.cc/qq5fJSyG/bsod05.jpg
https://i.postimg.cc/JnFKGLYt/bsod06.jpg
https://i.postimg.cc/gk3FFSr3/bsod07.jpg
https://i.postimg.cc/Pq30z0Fn/bsod08.jpg
https://i.postimg.cc/JnSgSZLT/bsod09.jpg
https://i.postimg.cc/XYnhMnR0/bsod10.jpg
https://i.postimg.cc/zGpQ89NH/bsod11.jpg
https://i.postimg.cc/1XxCvSG2/bsod12.jpg
https://i.postimg.cc/T2mHpyG6/bsod13.jpg
https://i.postimg.cc/g2cMSNhz/bsod14.jpg
https://i.postimg.cc/5t6s1ypD/bsod15.jpg
https://i.postimg.cc/T1X0r9GX/bsod16.jpg
https://i.postimg.cc/2yFwTZ8L/bsod17.jpg
https://i.postimg.cc/8khtTqBk/bsod18.jpg
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