The exact error message you will see is
Directory Services could not start because of the following error:
The specified network password is not correct. Error Status:
0xc000006a. Please click OK to shutdown this system and reboot
into Directory Services Restore Mode, check the event log for more
Moral of this story is to ALWAYS CHECK YOUR FREAKING BACKUPS and make sure they are done regularly and inspected regularly.
This mistake cost me 2 days of working on this. I should have checked the date modified on my system state restore.