Here's a new one for you:

Going back to Fall Creator Build 1709 worked perfectly. Finding this ISO was a bit difficult, but it's out there.

I DDU'd my GPUs, and then attempted to restart. I'm getting Error 55 on an Asus Z97-Pro (no memory detected)

I tried different sticks of ram, 1 by 1 in the appropriate slot...nothing. A new PSU...nothing. used the MEMOK! button which didn't do jack. I can't even boot into bios. Re-seated the CPU...nothing. The seller told me the mobo had 2 bent pins but it was working "fine" after I travelled 30 minutes, SO i just bought it. To his credit, it was working just fine. Is it possible that these bent pins suddenly screwed everything up after being fine for 3 weeks?