What is this burned part on my logic board?
I have a 15" MBP a1286 2.66GHz. Today when I plugged it in after not using it for months, and pressed the power button, I noticed that it was getting very hot at the bottom of the case. I unplugged it, took out the battery and pulled the buttom case. I saw that a small chip to the right of the memory slots had burned up. It's indicated by the arrow in the picture below. I'd like to know what this does, and if it indicates a problem elsewhere in the system. If I replace the logic board, will I just cook another one? Also, the cable below that chip was not fully seated.
This is kind of a monster computer that I built from two broken ones, so it's not really a surprise that something like this happened, but I would like to get it going again. However, I don't know enough about the logic board to know if this indicates a problem with some other part that will effect my new logic board if I put one in.