There are many ways to do this, including un-plugging components one at a time. That can work, but it's not always successful, and is a pain..... There's an easier way:
It's called a Mechanic's Stethoscope, and can be purely mechanical like the photo.....or electronic using a small battery powered unit, and a pair of headphones. I use the type in the photo.
What it does is amplify noises at the probe end (use a non-conductive type), while at the same time lowering the noise from near-by components. You can find the source of any small noise in a computer.....no guess work involved. Auto parts stores sell these things, also JC Whitney. Cost...cheap. From a few dollars to $20 or higher.
If you're real cheap, make your own out of a small hollow tube...just don't poke your ear.
Pin-pointing small computer noises.
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I have also found that simply sticking the handle end of a long screwdriver or similar item in my ear while using the blade as a probe works fairly well, and doesn't require any tools you don't already have.
As a minor note when using the mechanics stethescope, be careful with the probe, hitting it on things can HURT due to noise amplification! I hate to think what sticking it in a fan blade would sound like.
Gooserider
As a minor note when using the mechanics stethescope, be careful with the probe, hitting it on things can HURT due to noise amplification! I hate to think what sticking it in a fan blade would sound like.
Gooserider
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The problem with the "Screw-driver to the ear" thing is you can't see what you're doing very well. I've never minded buying seldom-used tools if they are cheap. This stethoscope could last a life-time, and you'll find many uses for it. If you're using the cheap DIY device, be sure to cover your other ear to eliminate other noises. This technique works....