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Myth #6: Turning my PC on and off will reduce its performance and useful life.
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•In the early days of personal computing, the alleged damage caused by turning PCs on and off may have held some truth. But thanks to improved, modern hardware, these fears can be put to rest. According to the Rocky Mountain Institute: "Modern computers are designed to handle 40,000 on/off cycles before failure, and you're not likely to approach that number during the average computer's five to seven year life span. In fact, IBM and Hewlett Packard encourage their own employees to turn off idle computers, and some studies indicate it would require on/off cycling every five minutes to harm the hard drive." Powering down your computer may actually extend its life cycle by reducing the intake of dust, which can cause fans to seize up or parts of circuit boards to overheat.
•If you refresh your PCs every 4 years, it would require you to turn your PC on and off ~27 per day every to reach 40,000 on/off cycles within those 4 years.