I have resently bought a Mach II thats wasn´t new. Now there is a problem with. It´s the fan in the front that don´t send a rpm signal. I know that because i have switch´d the fans conections so it´s not the control bord. The spins so thats not the problem. My problem is that the mach won´t start if it don´t sense that the fan is spinning. I have tried to install the annother fan in the back and the one working in the front but the 120mm fan in the bach won´t starta att all. Whats the problem? Where can you by spare parts for your mach II, like the fan?