Sounds like you have the newer "L" type MagPro connector. Unless you have replaced the original power adaptor that had "T" rather than "L" connector. your MBP is newer that those covered in this forum. If your MBP has black keys, its power issues and specs are different from the older MBPs (silver keys) that this forum covers.
Is that's the case, you should start a new thread in this forum section created for the late-model MBPs:
http://discussions.apple.com/category.jspa?categoryID=251
I know some web forums don't like people starting new threads but, around here, it's preferred. When you tag on to a thread the someone else has started, it makes it harder for the community to help the original poster, and you don't get the attention your issue deserves.
It can be hard to figure out how to start e new thread around here (hopefully that's changing). This article will help you do it:
http://discussions.apple.com/ann.jspa?annID=650