I have a Macbook that is nearly three years old, and I'm on my second power cord. The first time I had trouble, the casing had melted off right next to the MagSafe part that plugs into the computer. I got another, and now it seems it won't charge at all. There is no apparent physical damage. At first, I could do a little jiggery pokery and if I got it in just the right place, it would charge. It seems that now even that is gone. I'm wondering if: 1. There is some obvious fix that I am missing, or 2. Where I can get an affordable replacement. Thanks! Edit: I realised this makes it sound as if my current cord is brand new, that is not the case. It is about a year old.