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HP Pavilion Power - 15-cb006nl
Microsoft Windows 10 (64-bit)

Hi, let me explain the situation for a moment:
My laptop had a swollen battery for a few months and the main fan was making a noise that alternated between "bearable" and "Boeing 747 taking off".
I decide to change the battery, and while I was waiting for the new battery I was left for about a week without a battery in the computer and used it only with the power cord.
During this week the computer both used under stress and even in a quiet way did not emit a single decibel of noise, very silent fans.
After installing the new battery the fan noise returns, louder than before.
I decide to remove the body of the pc, once removed I turn on the computer, silent again, today after about 3 days the noise is back. What can I do, what could it be?

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