You getting any power atall? engine power etc? Could be a shorted battery, or a relay/fuse. sure you have checked all your fuse boxes? To be honest its pretty basic leccie pish to disconnect the car power before you break into the system, I will bet with fuses.
Sorry about the English,right the dash lights up on the ac control panel but the yellow lights on the demister the ac and the other one don't at all but the ac still works,the radio is getting no power at all and the time an temperature dont work either,engine an everything else works fine,changed a good few fuses on the drivers footwell but maybe I have not done the right one