I'm not saying that the fact that I plugged my headphones into my Macbook is the reason that my headphones became defective, but I had previously used them with my iPad right before plugging them into my Macbook and they worked just find. I plug them into my Macbook, and suddenly I'm only getting sound out of one side. It also only plays out of one side now when I use the headphones with my iPad. Is it possible that plugging my headphones into my Macbook somehow caused them to become defective?