Hi, As most of you know, Macs have temperature sensors. In my early 2008 15" macbook pro, the hard drive has a built in temperature sensor. I recently replaced the hard drive with a new one... The new one doesn't have a sensor in it. My computer now reads the temperature from the hard drive as 0º Celsius, which is the temperature at which water freezes. It is not that cold in my house, let alone a MacBook Pro with millions of transistors. Because my computer thinks that my hard drive temp is 0º, it does not think that it has to cool my computer down. This then leads to my computer over-heating, and coming to a few degrees away from what is supposedly the temperature at which the system will automatically shut down: 200ºf Any ideas as to how to trick the computer into thinking that the Hard Drive temp is maybe around 90ºF?