Win10 VM no longer starts, won't troubleshoot

[JLKunka]

I successfully created a Windows 10 virtual machine and began adding programs such as Blue Iris to monitor security cameras. All was working well, even upsized the default virtual disc to add space, went through a windows update, etc. Now the VM won't start. It enters the troubleshooter, asks "select keyboard layout", then no repair options work. I am left with "Startup repair couldn't repair your PC". I can reboot and get to the same point but am baffled at what changed.

 

I had a parity error and am currently rebuilding the parity drive, but there were no errors showing on any of the data discs.

Anyone with troubleshooting suggestions?

[JLKunka]

I created a second VM instance with exactly the same procedure. Loaded the same software, applied the same Windows update, and this one appears stable. I did make some restore points before and after the update to be safe, but I'm at a loss why the original doesn't work.