Server 2003, one of our two DCs. Yesterday it went down and I didn't have time to figure out what was wrong so I turned it off and seized all the roles. The other DC is working fine, everything on the network (including Exchange) is happy now.
I don't want to wipe this DC because there are a few other things it's used for and I'd prefer to avoid having to reinstall them.
The machine is working now. It turns out the only issue was a failed HD that prevented it from booting. I ranted about that here.
This DC has AD, DNS and DHCP running on it. It has been offline since Sunday.
My questions - what should I remove / change before putting it back on the network? Can I just remove the roles that the other DC seized? Should I unjoin the domain? Should I uninstall AD?