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On a high-quality system, the power supply is a reliable component that will function for many years without much problem at all. In fact, the power supply is probably the least likely component to fail on a typical system--provided you don't skimp and get one that is made ultra-cheap.
Most of what you need to do to keep your power supply running well is actually covered under the section regarding system care. The power supply's chief enemy is overheating, and this is usually caused by excessive dust and dirt coating the components and clogging the power supply fan. Of course, problems with the external power being fed to the power supply can cause difficulties as well. I recommend the following basic maintenance procedures here: