Had an issue with humidifiers many years ago myself. We rocked up at work one day (this was at a local council) to find the server room covered in puddles of water. It was dripping through ceiling tiles, all the vents, everything. Obviously the first thing we did was to immediately shut everything down and kill the power to the room to protect the servers and reduce the risk of electric shock.
After the maintenance guys had taken a look, we found out the problem. Turned out that the previous day, a new humidity control system had been installed for the building's central ventilation system. The job however had only been half done and the control unit for the humidity regulator wasn't set up properly. They'd then left the system pumping out maximum humidity overnight. Unfortunately, the main plant room was adjacent to our server room, and the first place this nicely humid air went was through the ducts/vents above the server room.
Of course, the server room is a cool room due to the air-con, so the moisture in the air immediately condensed and dripped out all over the place. My colleague's LCD screen had over a litre of water in it when we tipped it upside-down.
The solution was to install the proper control unit for the humidity system, and re-direct the vents so that the "central air" system no longer pumped through the vents above the server room. Amazingly we lost no servers due to this. The only casualty was a desktop PC that ended up with blue/green rust on the motherboard. Even the previously mentioned LCD screen worked fine once we took it apart, dried it out thoroughly and then re-assembled it.