I bought by mistake a fake MagSafe 2 charger for my Macbook Pro 13 Retina. After using it for around a month I decided to pay more and buy the original one for the sake of my battery health. After opening the box and plugin it in, it just didn't light up, I've tried many times and nothing.
The new charger works on my girlfriends MacBook without any problems and the fake one still works on mine! Both chargers are 60W MagSafe 2 (the proper one).
I tried reseting SMC and PRAM, but no luck.
Did anyone have this problem, what could it be?