Hey, is it possible my brother's PowerBook (This is my brothers I am asking about: specs in signature, cept without 250 GB HDD, instead it is 80) hard drive is failing? His mac gets SUPER warm in the bottom left corner, and that vent on the side doesn't seem to do anything. I am wondering whether or not to replace it, but since he just uses it for school, I don't see why I should if it is not dying. Is excessive heat one of the signs of HDD failure? Was this model of the 12" PowerBook known for heat issues? It is not the fan, because I just replace the fan a couple months ago because it had died. This new one is an apple part. Anyway, the RAM does not get very warm, and the processor and graphics chip are all fine. Its just that HDD!!