I recently (2 days ago) installed a brand new HX1000W psu. Bench testing proved that it was quiet, etc, everything you'd want.
Today, however, I noticed a faint buzz in the PSU. It's an electical buzz, constant, the sort normally associated with transformers, electric fences, that sort of thing. Maybe even a bit like a wasp from afar.
It is made when it is plugged in, no matter what plug it is plugged into. It makes the noise whether the power switch is on or off, and doesn't change however much load is on the power supply. It is not the fan.
Should I RMA? The noise does not bother me at all, since it can only be heard (when the pc is on) if you know what you are looking for. What I am bothered about is the smell of burning and trashed pc that could result from it, which would obviously be a catastrophe.
Because it happens when the power switch (on the back) is off, it suggests that it's a faulty connection in that, rather than anything else. Am I right?