Hi,
When I was poking aroung inside my Earthwatts 500W looking for the source of the buzzing noise. I found that it was coming from the heatsink, which is live with high frequency voltage. It sounding as if the heatsink was rapidly arcing. Unfortunately, I then fried my psu by shorting the heatsink to ground.
Hopefully, this helps anyone looking for another source of psu buzzing.
PS. I am now considering buying the Corsair HX520
Antec EarthWatts 500W Powersupply heatsink buzz
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