I would just like to add a node of caution to this. When acually replacing the fan, please make sure not to touch any sort of capacitor. These can and will kill you. For those who do not know what one is, they are normally tall cylindrical type things. They can be very small and very large. Most can hold enough electricity to give you a good jolt. If they are large enough, they will kill you. However if you don't know what one is, its prolly best not to go poking around in a power supply anyways. For the daring: just remember, if you don't know what it does, don't touch it. (There are normally some capacitors around your CPU)