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Electromagnetic Interference (EMI)
All electronic devices give off electromagnetic emissions. This is radiation that is a byproduct of electrical or magnetic activity. Unfortunately, the emissions from one device can interfere with other devices, causing potential problems. Interference can lead to data loss, picture quality degradation on monitors, and other problems with your PC, or problems with other devices such as television sets and radios. These are generally categorized as electromagnetic interference or EMI problems.
There are actually two different issues here: EMI emissions by the PC, and EMI emissions received by the PC. PCs generally do not cause very much interference with other devices; they are required by the Federal Communications Commission (FCC) to be certified as Class B devices. This certification is used to show that the PC conforms to standards that limit the amount of EMI that a PC can produce. The only catch to this is that you have to keep the cover on the PC. This is one reason why the cover is always made from metal. (Keeping the cover on is also an important part of ensuring proper ventilation).
PCs can be affected by electromagnetic interference from other devices, in two major ways. One is direct effects through proximity with other devices; another is electrical interference over the power lines. Most PCs generally do not have many problems with EMI, but those that do can cause incredible frustrating to their owners. There are several things that you can do to avoid or at least reduce EMI if you think it is affecting your PCs: