Hi, I have a 13" macbook from around 2006 with core2duo processor. Recently it has begun turning off the power automatically, especially when watching videos or when I do anything more demanding than surfing. The problem doesn't occur when I put an ice-bag beneath the laptop - so it's definitely a case of the processor overheating. My question is how do I solve this? Would replacing the fan definitely help? Or could there be a different reason behind this malfunction, because I can hear the fan still spinning? thanks for your help.