I have just bought a second hand Pace 3100 and the fan runs all the time. I don't need the PVR functions, just 5.1 audio so I pulled the HDD out of it (added benefit of stopping the silly lights on the front. The box works OK but the fan starts from cold and it's reasonably noisy. There is no way the box is too hot as I have just put it back in the rack. Does anyone know where the heat sensor is? Do I need the fan if no hard drive is fitted?