Macbook Pro is from early 2008. Used the charger it came with for 5 years until it suddenly gave out. Got a new one and within a few weeks it was starting to fray near where it connects to the laptop, and it has only gotten worse since then. I've heard that this is a very common problem with the new charger cords (were these even tested?), and was wondering what peoples' experiences are with getting apple to take responsibility for it? Am I likely to be told that it is my fault, or will they replace it?