Laptops usually have one fan to save on space and weight. There are several fans in a computer, including a PSU (power supply unit) fan, CPU (central processing unit) fan, case/chasis fan, and the GPU (graphics processing unit) fan. While this might not be a cause for alarm on its own, when combined with overheating of the CPU it is definitely a red alert. It is therefore alarming when you notice that your CPU cooling fan is not spinning. This can be done by use of cooling systems, coolants, and more popularly, by use of cooling fans. In order for your computer to function at its optimum, cooling is essential. Remember that it is normal behavior for the CPU fan to stop spinning when the CPU temperatures are low or you are not running any power-hungry applications. Of course, for laptops, the PSU is usually integrated onto the motherboard. The same problem could originate from the PSU (power supply unit) if it is not able to output the 5V or 12V to power your fan. Your motherboard could also be the problem if the circuit supplying the power to the fan is fried/short, then your fan will not be able to spin. The wires going into the fan can also get in the way of the fan blades and prevent it from spinning (these fans don’t have a lot of torque). The fan can get clogged with dust and lint hence preventing it from spinning. If your CPU fan does not spin, the issue could be anywhere from the fan, the motherboard, to the power supply unit. If your BIOS has been misconfigured or is outdated, you might have problems with your fan. The more the temperature and CPU loading, the faster the fan spins. When the temperature goes beyond the threshold, the fan usually comes on. The CPU fan is then controlled by the BIOS in a stepped mechanism. One to supply the voltage (red), another is neutral (black) and the other is used to control the fan speed (yellow). The port that the fan connects onto the motherboard is known as the fan header. The CPU fan is usually supplied with a 3V or 5V from the PSU (power supply unit) on laptops and 12V on desktops.
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