Can anyone tell me what this sound is?
https://drive.google.com/file/d/1-VZs9pOt7SlGXsNfJHGrHyMNAddVWdFt/view?usp=sharing
https://drive.google.com/file/d/1-VZs9pOt7SlGXsNfJHGrHyMNAddVWdFt/view?usp=sharing
That sounds like a fan is clipping against something, like a stray cable or even the ticking of the fan's motor. Are you sure the source of the noise is from the PSU? If it's the PSU, what's the make and model of the unit and it's age?