Abstract: The present invention provides a cooling security system that combines a hardware apparatus with a software routine. The cooling security system detects problems associated with the operation of the fan which is the main component for cooling or heat dissipation, and provides notification of the fan failure to the user via the computer screen. Furthermore, the cooling security system reduces the possibility of overheating by reducing the amount of heat generated by the main heat source, the CPU, by lowering its speed. The present invention also responses to the "GREEN" (Power Down) signal provided by the system board and stops the fan in order to save power.