Windows 10 won't boot, won't enter safe mode, stuck in recovery environment

I left my computer for a bit and come back to find it in the recovery environment.

I tried the automatic repair options, startup repair, no change. I used the console to do sfc check, it did fix some files, but still no booting.

In the recovery environment, I tried to enter safe mode using the start up settings, I get the menu, but it did not boot.

I tried to enable boot logging, but the ntblog.txt has not changed.

I don't have a restore point.

BCD looks good, but I did a rebuild, just in case.

Hardware all looks good. I swapped the graphics card, disabled all usb devices, just to be sure, nothing helped. I can access all drives and files from the console in the recovery environment.

I would like to get a sense of where it is failing, preferably boot into safe mode, or failing any options, try an inplace upgrade, but AFAIK, it has to be started from the OS.

Any ideas what to try next?

OS: Windows 10 CPU: i7 3970x MB: Gigabyte x79 ud5