I'm a clown.
I noticed what the issue was when I took the board out sat on the floor directly under light.
I've bent the pins in the am5 socket.
All in on the new board now, just booted into windows fine, doing the bios update to latest now and then will fire up 3DMark.
Doh.
Yes, I did mention checking the pins in #254, the problems you had did have a hint of something like that, as soon as you said your old CPU wasn't working either.
Glad you got it sorted.
