Cleaning up a mish-mash of domain controllers

After seizing all the FSMO roles on a single domain controller and deleting its replication partners in AD Sites & Services, I tried to join a PC to the domain and got this error:

After verifying that the DNS server settings were correct, rebooting, and verifying that the SYSVOL share was present on the domain controller, I ran dcdiag on the domain controller and saw this:

The DNS console was unusable:

The DNS event log was littered with red ink (so to speak):

So I followed instructions from https://support.microsoft.com/en-us/kb/2751452 and it worked!  Yay!

These were the instructions:

• Stop the KDC service.
• Run the following command with elevated rights: netdom resetpwd /server: /userd: /passwordd:*
• It will prompt for the password of the Domain Admin account that you used, enter that.
• Once the command executes, reboot the server.
• DNS zones should load now.