Help!

[movingincircles]

Hi!

I'm having trouble with my CPU FAN (I think, because I unplugged my case fans and the noise was still there!). I have a p4 2.4ghz and whenever I turn on the computer, it is unusually LOUD like the fan had pebble stuck in it. So I checked it, and it was clean. There was nothing in it. So I turn on the computer again and the noise is still there for about 20 minutes! Is there any way to get rid of this NOISE?!?!?

 

[Mik3y]

yes, get a new cpu fan. getting good and quiet cpu fans normally cost more then stock and sucky ones tho. you can find some good ones at newegg.com. also, are u sure that your power supply isnt loud too?

 

[movingincircles]

this cpu fan is from intel (boxed cpu and fan 2.4 ghz)


I cant really tell if its my cpu fan or power


but im sure its one of those two


any way to find out?

 

[mechBgon]

Yes, try unplugging the CPU fan for a few seconds.

 

[lobadobadingdong]

it could just be a dry bearing, take the fan off the heatsink carefully pull back the sticker on the fan and add a drop of machine oil to the bearing and put the sticker back on, if it works then you just saved yourself a few bucks on a new hsf (or fan)

and I wouldn't recommend unplugging the fan while it's running, it's possible you could fry the motherboard when you pull or plug it in while it's running (exeptions are the hot plug fans you often find in professional workstations and servers) just put the tip of a knife in the fan blade path, when a fan stops and the noise goes away you just figured out which fan is causing the racket.

 

[DaNorthface]

turn off your computer and spin the cpu fan with your finger. See if it hits anything.. Maybe the wires are hitting the fan and you don't even know it.

 

[Jeff7181]

Originally posted by: lobadobadingdong
it could just be a dry bearing, take the fan off the heatsink carefully pull back the sticker on the fan and add a drop of machine oil to the bearing and put the sticker back on, if it works then you just saved yourself a few bucks on a new hsf (or fan)

and I wouldn't recommend unplugging the fan while it's running, it's possible you could fry the motherboard when you pull or plug it in while it's running (exeptions are the hot plug fans you often find in professional workstations and servers) just put the tip of a knife in the fan blade path, when a fan stops and the noise goes away you just figured out which fan is causing the racket.

That's an even worse suggestion than unplugging it while it's running. That's a great way to burn up the fan motor or burn up the fan header on the motherboard.

When the fan is spinning, the resitance of the windings in the motor increases due to EMF. If you know anything about electricity, you know increasing the resistance reduces current flow. That's what stops an electric motor from burning up since the windings are basically just long wires. When you stop the motor from spinning, you remove that EMF and the resistance of the windings in the motor decreases down to almost nothing, and current is free to flow until something burns up, or some sort of circuit protectioin kicks in and opens the circuit, like a fuse or circuit breaker, etc.


The correct way to do it is to shut the computer off, unplug the fan, then start the computer. If the noise is gone, then that's obviously the cause of the noise.