Because I was trying to install a new graphics card on my server… It BSODed at some point and damaged system files.
I’m running Server 2012 R2 Essentials, so it’s a domain controller. Somehow the file system got corrupted and prevented LSASS from loading. This is a key part of Windows and “bad things happen” if it can’t load right or is terminated.
Specifically, I was getting a “2e2” BSOD from the system. I was able to get into the “Directory Services Recovery Mode” option. This is basically a safe mode for Active Directory.
Due to a couple of issues, I suspected a disk error. I was right. Ran a chkdsk on the system and it started booting just fine!!
Just wanted to post this for anyone else that ran into this weird BSOD.