As I am training to be an electrical and computer engineer, having taken a class called EMF(Electromagnetic Theory), and having worked for GE Medical Systems on several projects requiring EMC knowledge, I really don?t think you have much to worry about. First of all, a grounded metal case will help block these fields and emissions, but not completely. If that would do it, it would be much easier to gain EMC (Electro-Magnetic Compliance/Certification) for certain products. Second of all, it isn?t a very big issue in a household, or even office environment. I bet you would be hard pressed to find something that is seriously going to mess with your computer, or something that will be at all messed up by your computer.
Don?t worry too much, just don?t set it next to a table saw that runs at 230V or put any super sensitive electrical interments next to it and I am sure you will be just fine.
Paul