I recently bought (2 days ago) a Corsair HX750W and the first time I turned it on I heard an odd staticky noise. Now I should note that this sound is incredibly feint. If the tower is sitting at my feet (PSU at the bottom), I cannot hear it from a sitting position. I checked for sparks since it sounded like an electrical thing and did not see any. I also listened to 'coil whine' online and it's more stacking and definitely does not have the very loud noise that comes after the staticky sound. I am not sure if I should just RMA the PSU or not since I already have to RMA my HDD (it occasionally utters a single loud click sound). I'm thinking I'm going to RMA just for piece of mind.