psu makes high pitched noise

[asdf2345]

i have a old fsp300-60btv and i hear a high pitched noise from it now you might say 15amps (12v rail) are not enough amps but i had a old cd drive and plugged it in the psu so just running 1 cd drive it still makes the noise

 

[voyagerfan99]

Probably just some coil whine.

 

[mistersprinkles]

^+1

Annoying as hell but funcitonal.

 

[Okedokey]

Under-loading a PSU can cause excessive hysteresis, which is what you're hearing.