Question Fan weird noise

NEOCROM

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Feb 10, 2013
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Every time i start my PC, a weird sound comes from my fan, it stops after a time, but can also start again. Is there a way to fix this or do i have to replace it? Also, what is the reason this kind of noise happens?
 
Fan is almost 2 years old. The noise is kinda like a rattle, like it's hitting something, but just checked, no strange object there. And i hear the sound mostly coming from CPU fan, but i think i've heard from power source fan too from time to time.
 
If the sound is coming from multiple sources, then you have multiple problems.

It should not be difficult to determine if the sound is coming from the CPU cooler fan or not. What kind of CPU cooler do you have? Is it the stock cooler or an aftermarket model?

What are your full hardware specifications including model of CPU, motherboard, memory, power supply model and brand, CPU cooler, case, etc?