Have monster purity pro set that havent used for two years since had no charge problem. Tried with usb from computer and from socket with charger. No charge. Maybe 50 times replugged. Headset makes sounds when you plug in the charger.
Well guess what!
Today after plugged it in to my playstation 4 pro with the ps4 usb chargers its charging and I can finally use it as it was supposed to be used. Must be some specific voltage and cable as people have mentioned before. Try from different sources.
From wallsocket nothing happens
From laptop usb red light comes and disappears.
From Ps4 it chargers normally keeping the redlight on.
Could not be happier.