High frequency/ultrasonic sound comic from new build

[iwau]

Just did a build a week ago using my 8+ year old power supply and its attached fan as part of the components. Ever since I first started it up, there has been this faint, high-pitched, high frequency sound coming from the front of the case where I installed the power supply fan (and where a fan that came pre-installed with the case is). I hear it more often than not, but it does have its moments of silence.

I'm around 85% sure that the old fan is what's causing the noise, but it's never happened when it was still inside my old computer, and taking it out did not help in determining whether or not my guess is true as its wires disallowed it from getting too far away from the case. I also tried just stopping it via cloth+finger while it was running to see if the noise would stop with it, but the uncovered noise of the other components made it really hard to hear the difference.

Since I can't turn the fan off, the only way to test my theory without cutting the wires is to buy a new power supply. So before I do that, are there any other possible components aside from the fan that would be able to generate this noise? Anything else I can do to test? Or should I just be buying a new PSU anyway since it's so old?

 

[Ironsounds]

Hello... Roll up a piece of paper... place to ear and computer components... for closer examination. Some FREQ's/noise can be amplified inside a steel box, much like speakers and singing in the shower... typically placing foam and other sound absorption materials, can reduce this.

 

[iwau]

Hello... Roll up a piece of paper... place to ear and computer components... for closer examination. Some FREQ's/noise can be amplified inside a steel box, much like speakers and singing in the shower... typically placing foam and other sound absorption materials, can reduce this.

Thanks a bunch for the tip, my guess was wrong: the noise was coming from around the CPU area instead. It seems that what I was hearing were electronic noises from the motherboard; disabled C1E in the bios and the noise is 90% gone. I can still hear a tiny bit of it sometimes so I wonder if there's more to the sound but either way the biggest headache is gone.

 

[Ironsounds]

Hello... Home Depot has very low cost 'closed cell" Foam you can masking tape in side a case for Noise... They Also have 'open cell' foam you can masking tape over Fan openings for Dust prevention and some extra "High freq" noise help too.

 

[iwau]

Just want to update that the sound is not gone, and 90% relief I had experienced the first day had pretty much left by the second--I've been hearing it almost constantly for the past ten minutes after turning it on, with mere seconds of breaks. I've identified that the sound is around the CPU/motherboard area but fixes I've found online such as disabling idle does not help. Anyone know what else it could be?