I have a Macbook White (13-inch, Mid 2009) with 6GB's RAM running Mavericks 10.9.2 and the fan always seems to run for some reason. Its running on a hard surface (my desk) and the power is plugged in. I do not understand this behavior as it runs with lots of apps running or with few apps running. Doing a Google Search this is a very common problem that I just cant find a solution for. Does anyone know? Thanks..