1. Any conductor through the electric current will cause an electromagnetic field in the surrounding, this is the theorem of high school physics. 2. chassis electromagnetic radiation will not affect health, I think there is no evidence can directly show that the chassis electromagnetic wave can affect health, but there is no evidence to show that it does not affect. Under these conditions, a complete EMP shielding design, follow the electromagnetic wave shielding of the chassis is undoubtedly the most foolproof choice. 3. Many people say that they have been using the PC for how many years without problems, I think that electromagnetic radiation will not be fatal harm to all people, but does not rule out some people harmful. For example, hospitals, including the U.S. Empire's hospitals are strongly recommended that pregnant women do not stay long at the computer. China also has a tumor patients should not always be in the electromagnetic field environment recommendations. Including microwave ovens, qualified microwave ovens have electromagnetic protection design on the window.