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A lot of Emachines, Dell, and HP epecially; the fans come on when you power up your computer, then shut off. They are triggered by a thermostat. Once your PC gets hot enough, like when you're playing games that take a lot of CPU usage they will kick in, usually speed up. So if your fans keep turning off, there is nothing to worry about, just your CPU hard at work ;)

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Q: Is the fan supposed to run 247 on a destop PC to prevent overheating or should is only start when the CPU thermostat trigger it?
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