Hp 6730b fan speed fully fast
It sounds like your laptop is overheating, hence it speeds the fan up. I would reccomend dismantling the laptop if you are confident in doing so, clearing any dust/debris from the cooling system and putting fresh thermal paste on where applicable. Hopefully this will cure your problem. If you are not keen on taking the laptop apart I recommend taking it to your local repair store for a cooling system service.
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