Reason:- The reason for the noise is HEAT generating by your computer it doesn't matter the computer is new or old .It depends on the Heat sinking capacity of your System fan.
Solution:
Step-1 Understanding Heat
Like most electronic items ,your computer heats up because of different reasons so you have to find out the perfect solution for cooling down the heat of the system.
Step-2 Cleaning of your TOWER/CPU
Open your tower if you are not able to do that so you can take help from a computer expert and clean your computer .
Step-3 Change your CPU Fan.
Step-4 Upgrade your Fan to more heat sink efficient fan.
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