

You mentioned a buzzing in another reply. That sounds like a grounding issue to me. Any chance you blew something under the board that is causing a short? At this point it would be wise to do a full tear down.
I’m almost at my train stop, so one final question before disappearing for the day: when resocketing the CPU did you put it in correctly and was there damage when you removed it initially?
That has been my experience recently. I had the same mindset as you until a critical piece of software I use shat the bed on Arch (LiveCaptions) that affected my being able to watch training videos for work.
Because it was time critical and I didn’t feel like possibly breaking other things for one package, I grabbed the flatpak. It came with its own nvidia driver package (mine was newer) and it worked out of the box without having to mess with anything and that was enough to change my hardline view on that.
Now it’s just another tool to use in an emergency when important things randomly break.