Question PSU buzzing noise when its off

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Sep 17, 2019
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Hello
My PSU suddenly started to make a buzzing sound very low frequency one you have to put your ear behind it to listen to it but at night you can hear it even when you stand next to it, regardless if my psu is on or off, as soon as i turn on my aircondition the sound starts , my psu is a 1600w superflower platinum leadex its one years old works perfectly without and any problems