I have an HP Pavilion dv 4000. Lately, it was been running really hot in the upper left hand area. I'm not sure what part is there, maybe the processor? I don't know whats up with it. The fan runs like all the time and its not blocked at all so heat should be able to get out but it always feels hot. I was thinking I should upgrade the fan in it, but then I thought of the un-upgradeability of laptops. Do they make aftermarket fans for laptops? What are some good ones? Thanks!