Shielding Your Office from Magnetic Fields?

jonfromspace asks: "We just recently moved into our shiny new office, and low and behold, we have a problem. It seems that there are 3 50HP "Chillers" beneath our office, and whenever they fire up, an entire 1/4 of our office gets filled with this crazy magnetic feild! We tested this theory by placing a box and a monitor on a chair, and moving it around the office. As we entered our Bermuda Triangle, the tell tale signs of magnetic interference appeared on the monitor (Rainbows, Moirre patters, etc.) This field has caused 2 RAM Dimms, 1 HD, and 1 Mainboard to fail in less than a week. We currently have our entire staff on one side of the office, and we need to solve this quick! Does anyone know of a way to shield our office? The Electrician we asked suggested placing a large steel plate on the floor of our office and grounding it to the pipes. Is this a viable solution? Are there companyies that deal with this kind of problem?"