The fan triggers on ONLY when the temperature of the PROCESSOR heat sink goes beyond the settings of the thermistor fixed on it. This is to prevent any damage on the processor and so if there is any malfunction of the PC in its OS or the drivers , then it can be reset, Other wise check the ventillation ports of the PC cabin and clean them. A good ventillation must allow the fan to rest but if the fan works and shuts at times it is only because th processor works and heats. Clean the system, teh hard disk and files and defragment the system.
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