Macbook Powercord Overheated and Melted

I got my Macbook in August of 06. Two days ago I came to it after leaving it plugged in and found the box part of the powercord that plugs in to the computer was frayed/melted. I can see the wires and it only works temporarily. I can see marks where it plugs into the computer that look sort of charred, as though it overheated. If I did not purchase the apple care package, can this still be replaced? Has this happened to anyone else?
Macbook Core Duo White Mac OS X (10.4.9)

Not too surprised unfortunately. I have two MacBooks in the home and have gone through 8 cords since May. None have melted, but have came apart where the connector head meets. As mentioned, Apple should replace it without issue as long as you're under warranty.
Nick

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