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PC Fan Got Noisy

Not sure if it's CPU or Power Fan...



8:40 pm on Apr 25, 2005 (gmt 0)

10+ Year Member

Hey all,

I have bought a new pc about a month ago. Everything seemed to be fine. But after downloading a couple of movies all-night long for a few weeks, my pc got noisier.

I've opened the side of the case and tried to listen to that sound, but couldn't determine if it's CPU fan or my Power Fan (which blows air into my pc).

Somewhere someone suggested that sticking a pencil into a fan and stopping it for a few sec's could determine where the sound comes from. Is it safe to do that?

Anyway... That noise isn't big, but seems like there's some problem. My processor is Athlon 64 3200, arctic-cooling (CPU fan) and some Power Fan. CPU fan shows 937 (something, RPM maybe?..., I have asus probe soft. and it measures the speed, btw. m.b - asus) and P.F. shows 8800 then after a few secs goes to 8400 then 8000 them little lower, but usually it spins at 8437. I haven't noticed those speed jumps earlier.

That sound seems like something would touch the fan and it gives this sound. I checked the wires and they don't touch cpu fan, don't know about p. fan... Maybe graphic c. fan, but barely... Noise is similar to when there's some part poorly fastened and it gives this sound cause of vibration (but barely, I think it's one of those fans). For a moment when I move my case (just a little) the sound changes... or maybe it's just my ears...

So question for start, is it safe to try to stop the fan with a pencil for a few secs and determine where that noise is coming from?


8:45 pm on Apr 25, 2005 (gmt 0)

WebmasterWorld Senior Member 10+ Year Member

So question for start, is it safe to try to stop the fan with a pencil for a few secs

Before resorting to shoving something in it; i'd first look to see if the power connector for the CPU fan is easy to get at (they normally are); then just unplug it temporarily to see if it is the culprit.

The loudest fan in my PC is actually on the graphics card.


9:50 pm on Apr 25, 2005 (gmt 0)

10+ Year Member

I find that noise is the biggest hassle of a bunch of computers. Anyone have any easy answers? I replaced a power supply once only to find it was the cpu fan that was noisiest.


10:54 pm on Apr 25, 2005 (gmt 0)

WebmasterWorld Senior Member 10+ Year Member

My computer was driving me nuts with fan noise.
Finally, the CPU fan started to fail or stopped entirely.
The big clue for THAT was an internal temp sensor on the CPU chip that shut
the machine down with a specific message to that effect (amazing!)

I went to Fry's Electronics and replaced ever fan I could get at.
The power supply fan got changed when THAT module crapped out.
My 300 MHz Windows-95 machine is running like a champ,
and I don't have to turn the crank on the side or anything - Larry


11:33 pm on Apr 25, 2005 (gmt 0)

WebmasterWorld Senior Member 10+ Year Member

Hi damlag,
I doubt if stopping the fan with a pencil is such a good idea......
You might press the pencil against the fan housing and put your ear to the other end. That way you should be able to hear which fan is noisy.
dmorison's idea is also good, disconnecting each fan in turn for a moment to see if the noise stops.
Since the pc is just a month old, I assume it has a guarantee. MAybe, drop it back to the dealer and let them mess with it. That way if something blows, they will have to fix it....
Good luck :)


3:51 pm on Apr 26, 2005 (gmt 0)

10+ Year Member

thanx guys for trying to help me. I see this is very common problem among all of us. I once had an older pc (which I replaced with this one) and also had problems. My Power Fan, simply smoked, because of some parts in it that crashed it... but it was 4 year old. This one is new...

Tbear, I could drop it back to them and ask to replace it or smth, but I think they'll say... "Well, there's no problem with it, and the noise... oh well all fans are noisy..." I mean, I don't think they'll replace it, I've heard lot of bad opinions about that company and their attitude to clients is awful. Anyway... I think I'll have to wait, till it crashes and them ask to replace or save a couple of bucks and buy a new fan.

Oh... I'll try to check which one it is...
And somewhy it seems like it's a graphic card fan. When I try to hear and move my ear lower to the G.C. the noise sort of gets louder. My G.C. is Sparkle Geforece 6600 GT... I'll try to check.


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