Question Buzz coming from PSU, coil whine, fan or something else?

Nov 23, 2020
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Recently repaired pc by replacing PSU and GPU, though I think it was only my GPU that had died as it was a black screen issue with pc on but was advised to buy new psu by repair man

now I have had a EVGA 850w psu and a EVGA 3070 xlc for a few months, both brand new. Just a few days ago though I started hearing buzzing from psu, it almost always happens on start up and sometimes goes after 20 seconds or so and sometimes stays until I turn it off. It can also just happen seemily randomly and then continue until turned off. Video below shows the sound

https://youtube.com/shorts/on-8XCQasm0?feature=share