I have had two of these power cords and both have burned. The first after about a year of use, the second after three years of normal use. There was a class action lawsuit related to this power adapter because these cords have a tendency to fray and then burn. [...] Apple refuses to replace the adapter, saying that the problem was cause by misuse, and that I must have unplugged it from my computer incorrectly. Apple makes products that fail in dangerous ways and then refuses to accept financial responsibility for them. Think twice about buying Apple products.