Question PSU buzzing noise during boot up (warming up)

Apr 26, 2021
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Hi,

I have a Be quiet Straight power 10 500W PSU and I am facing with buzzing sound when I "coldstart" the PC.
Sometimes when I power on the PC I hear electrical noise from the PSU during the bootup (for around 15-30sec). After it "warms up" the sound is gone.
No noise under load or freezing or whatsoever. It is basically dead silent and perfect operation.
Wondering if anyone had the same issue like this. What should I check first?

Thanks!