I am looking for a program to rev up the fan in my iBook, and have it run constantly, to see if that is the source of the "grinding" noise that occurs when the laptop reaches a temperature, which is uncomfortable to touch (on the bottom). The grinding noise is not from the HD, and not from the DVD drive. I am thinking it is because of the heat, and it sounds a lot like a fan with something stuck in it (Hair, dust, and other such things). I am contacting Apple ASAP, to see what they can do. To say the least, i am not happy with the sound.