So the webserver was offline for a couple days while I grounded the outlet it's UPS is plugged in to. Apparently I never did that when I installed it (it's a really ghetto setup, lemme tell ya) so the UPS has been saying "building wiring fault" for quite some time.
I bought a new UPS (since the last one couldn't sustain the load during the last power outage) and figured now would be as good a time as any to do the switch-a-roo and fix the lack-o-ground.
Anyways, everything should be back up for now. I'll need to do another downtime in the near future to backup the server. It's got some bad blocks on it, so it needs to be replaced.