Electric buzz from wall power cables (not coil whine)

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OK so I made a similar thread to this because I could hear an electrical buzzing from my CM V450S power supply, which I thought unusual. A member suggested it to be coil whine, which I thought odd because of the unit quality, and I ran some tests. First, I let the PC sit for a while and then, making sure PSU switch was off, turned on the power to the PC and the monitor, from the wall. Even with both of them off and the PC having been that way for a good hour or so, listening around their wall-power cord sockets I could hear a near identical buzzing from each of them (not regular buzzing). I am sure it's not coil whine because they had been turned off for ages, and the buzzing stops almost immediately after I cut their wall power, and I would not expect such from a good PSU. But the screen had the same sound, so I knew it was not the PSU. I tried it again with and without a surged protected splitter, and from a socket across the room, and the same very low and quiet buzzing. Is this something to do with the cable contacts? I tried both the CM cable and an older 230VAC cable in the PSU and tried propping them up so they sit straight but same buzzing. I'm really confused- buzzing would be coil whine but the screen does it too almost the same (although it is an old screen) and the PSU has no 'residual voltage' to blame the noise on. Can someone help?
 
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smorizio
if the sound is the wall outlet and is 220v your best bet is have an electrician check the house ground. you may also have bad grounding in the outlets.
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makkem

makkem

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Jan 22, 2012
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Hi
Coil whine is high frequency while mains hum is low frequency and from what you say it appears to be mains hum.
As a first step you might want to get one of these if you are in the UK,this will tell you if the wiring and earthing (ground) is ok.
http://
 
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nah it's fine I had my friend's dad come over and check the noise and the PC in general. He knows a lot about PCs and he could barely hear the sound even when he put his ear to the PSU. His verdict is I'm overthinking it and there's no problem. I'm assuming it is fine, had no problems with countless electronics on those plugs over the 14 years I've lived in the house. It is a very, very, VERY quiet noise and it is low frequency.
 
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