Question PSU buzzing noise during boot up (warming up)

[Vadnay]

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!

 

[Juular]

Wondering if anyone had the same issue like this.

Coil whine ? It's not an issue.

 

[Vadnay]

Coil whine ? It's not an issue.

it is much louder than average coil whine.

 

[Juular]

it is much louder than average coil whine.

Any intermittent 'electrical' noise is going to be coil whine, your PSU is old, that adds to it. It could also be the fan noise, but you describe it as 'electrical' which i wouldn't really associate with noisy fans i've heard before. Can you record the noise ?