This is a worry that almost came true to me last week. My sons Laptop charge cord stopped working so went to Facebook and found someone selling a charger for it

This is a worry that almost came true to me last week. My sons Laptop charge cord stopped working so went to Facebook and found someone selling a charger for it. The charger was from amazon they said. It was an obvious fake and looked nothing like the company provided one but tested it and the voltage output was correct so used it. Fast forward several months and last week I noticed the casing around the cords power supply was deformed and had at one point almost melted. Scary to say the least.