I bought a new charger for this machine around a week ago and for some reason, the battery will not charge. I bought an aftermarket charger, entirely on the basis of costs due to my apple one dying after a good few years. The light on the button to open the lid of the laptop was shining for about 3 days, but has now turned off completely. Whenever I try to charge the laptop with the new charger, the laptop makes a slight buzzing noise (It's quite hard to explain what it actually sounds like). Today when I inserted the charger, the laptop did emit the turn-on bong but then switched off about 3 seconds after wards. If anyone has had a similar problem or knows of a cure, please reply below. Thank You, Matt.