Fan is there in the laptop to cool the system and manage heat generated by CPU, however sometimes the noise from laptop fan becomes so loud that it starts to annoy you.

If your hp laptop fan is making loud noise than please get your laptop cleaned, the dust which accumulates in the laptop fan hinders its operation, consequently leading to generation of fan noise, take your laptop to a repairman and get the inside cleaned away by a air blower. Dust is the most common reason which causes laptop fans to generate excessive noise.
Dust also hinders the air flow within the laptop and consequently the fan has to do more work to keep the temperature down and keeps on running for large periods of time.

Also make sure to check the BIOS settings, there is an option to always run the fan when laptop is on AC power, please ensure that this is disabled. Otherwise your fan will never stop while you are on AC power

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