Review on Replacement ThinkCentre 4004 A1U 4004 A2U Attachment by Bobby Washburn

I purchased this power supply and am using it as intended for a Lenovo desktop PC in a slim form factor. But regardless of whether it is connected to a desktop PC or not, but only to any socket or surge protector, the adapter constantly makes hissing noises. Therefore, for fire safety reasons, I keep it in a metal box when I use it and unplug it when the PC is not in use.