Anouk,
   I have some suggestions:  Check if it has power at all is to stick something magnetic on the actual magnet.  If so, can you cycle the magnet and have someone watch the LEDs on the MCB while you are cycling?  When the magnet goes to zero, the LED turns off, but when it cycles to maximum, the LED should be brightly lit, then it fades a bit as it reaches the saved address.  If it does not do this, chances are you have a blown MCB or power supply.   Lastly, does the power distribution board supply the correct power?  The problem may reside downstream of the MCB if the PDB has been affected.  

Good Luck,
Ross