A louder than normal fan in your computer, or a fan that makes strange noises, is not something to ignore. These noises are usually an indication that a fan is not working properly — a potentially serious problem.
How to Fix a Noisy PC Fan 2
Time Required: Cleaning all the fans in your computer will take about 30 minutes. If you have a laptop or tablet, it may take less time, and if you have a desktop computer, it will take longer.
Clean the CPU fan, as well as the graphics card fan and any other component fans you may have, such as RAM modules or other motherboard-based chips.
Cans of compressed air work great for cleaning CPU and component fans. You can usually pick up a bottle for around $5 USD on Amazon. Stand it upright, make sure your computer is turned off, and blow the dust outside if possible.
