Source of periodic buzzing noise in the walls

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Building noise troubleshooting: causes & cures.

Here we provide an extensive catalog of the sources of annoying sounds or noise complaints at or around buildings. We provide a Complete Index to Sources of Sounds Helps Diagnose, & Cure Noise Problems in or at Buildings .

These articles discuss building noise control: how to inspect, diagnose & cure noise or sound problems in homes or commercial buildings. Information is provided about auditory (hearing), visual, historic,...

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While computer audio is fairly mature, there are still problems that can crop up. One common anomaly is a buzzing or humming sound whenever you open a browser window, or move windows around on the screen. This can be particularly pronounced when the video is queued up to play, but hasn't started playing yet. There are a couple of possible causes for this behavior.

Likeliest Cause: EMI

The single likeliest cause of humming or buzzing is electromagnetic interference with your sound card from other components within the computer's case, with likely candidates being the video card, or the power supply on a desktop computer. The mechanism that's in play in your computer's chassis is that electrical devices that draw current generate magnetic fields, called Electromagnetic Interference (or EMI). This can cause your sound card to crackle or hum.

Desktop Solutions

If you have a desktop computer with a full ATX form-factor motherboard, you have a few options:...

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Any powered external speakers I connect to my laptop make a buzzing noise when my laptop is plugged in. I also have battery-powered noise-canceling headphones that make the buzzing if noise canceling is enabled. Quick summary:

Laptop Speakers Buzzing noise? ------------------------------------------------------------------------- Battery (any) No Plugged in Internal No Plugged in External, plugged into wall outlet Yes Plugged in Headphones, active noise canceling enabled Yes Plugged in Headphones, active noise canceling disabled No Plugged in Earbuds, passive No

The buzzing is louder if my display brightness is low, and especially loud if the display is turned off.

The buzzing happens with any power outlet: I've tested it in several buildings in two different cities. I have also tried plugging the speakers into a separate outlet from the laptop (one connected to a different circuit...

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You can try to buy a power strip but the noise is definitely because of the coil squeal, technically its okay to hear some squealing noise when its on and near full power usage but you claim when its off its making that noise leads me to believe you have defective caps. Of course even though your computer is off your computer still uses electricity, this is called phantom load, your computer still needs electricity in it to respond to your touching of the power button. As a suggestion let me know if you hear the noise when you turn off the power strip itself (should have a red switch on the power strip to turn it off from where I am from).

Also this is a common issue for low end power supplies including cooler master, they are made so cheaply that they fail real easily and die out within a year or two. This does not apply if you have one of those high end cooler master power supplies. Technically from now on I suggest buying from well known brands such as Antec, Corsair,...

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UPDATE AGAIN- Disaster. The cables on the walls outside are not ESB, they are NTL, phone - our ESB cables are underground. We had a guy from the ESB in the house for almost an hour checking everything he could think of. He could hear a slight humming sound but couldnt locate it.He didnt know what effect the foam insulation could have but Im really beginning to feel that (as one poster said) putting the foam in has caused the sound of the cables to be amplified into our rooms. The ESB guy said that the voltage from cables for NTL and phone wouldnt be as strong as for electricity but he did agree there was a slight humming sound in the house.

I am getting an electrician in tomorrow, but is there any point? The humming is there when the power is knocked off, our ESB meter is fine (been checked) and I cant get any cables moved as there would be nowhere else for them to go. I will get him in though just on the offchance something has been missed.

I know this is probably crazy but...

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My Microwave is not working and is displaying the error...

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I know this has been posted before, but I couldn't really find a post that answered my problem. My PB is constantly buzzing and crackling. It seems to be coming from both sides (if I put my ear to it), and it's frankly driving me nuts.

It gets worse if I'm doing something. If I just let it sit, it doesn't get as loud. But if I'm on the internet, and I'm moving my mouse around, or I'm on a site that has a Flash graphic, it gets incessantly loud. Even when I'm typing, it gets louder.

It does stop TOTALLY when I unplug the power. However, as the battery that I currently have is completely dead (it will only last a few seconds unplugged before it needs to power down), I can't really keep it like that. Could the drained battery be the problem? Since I don't travel much, I haven't rushed out to get a new one. Or is it something else?

Hopefully this is clearer than mud!


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Careless troubleshooting of a microwave oven can result in death or worse. Experienced technicians have met their maker as a result of a momentary lapse of judgement while testing an oven with the cover removed. Microwave ovens are without a doubt, the most deadly type of consumer electronic equipment in wide spread use.

The power supplies for even the smallest microwave ovens operate at extremely lethal voltage and current levels. Do not attempt to troubleshoot, repair, or modify such equipment without understanding and following ALL of the relevant safety guidelines for high voltage and/or line connected electrical and electronic systems.

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