What can cause such noise?

[Wicks]

Hey guys!
Today morning i had a problem, which autofixed itself: started up the computer and one of my fans started to make a crackling noise, sounded like something got into the fans, but after a few seconds it was gone. i checked it, and all my fans are working, nothing got in, no dust, nothing :S Can it be caused by cold temperature? Cause some kind of strange noise always comes when i start it up in the 20°C room, but it stops by the time the Windows starts up.

 

[Dan The IT Man]

Hi there,

This could just be an issue regarding the bearings in the fan, for instance they may be slightly faulty which may cause them to rub or rattle at a certain speed or when starting up since in most cases fan speed is a lot lower when your system is booting up.

It won't be the cold.

Hope this helps.

 

[Wicks]

I did some stress-testing, spining them up, but no noise. Turning it off, leaving to rest an hour, turn back on, no noise. But when i cold boot the computer in the morning after 8 hour rest there is a silent, but strange noise. Today was the first i got that loud grinding sound.