no ignition no start, no turn on the dash indicators

I don´t no what to do, my car is out of service, every day turn on and yesterday I can´t do it, no ignition no start, no turn on the dash indicators,

Hi, I have a Rolls Royce Silver Shadow 1977 78000 miles, when start with the key, no happen nothing, every indicator of the dash are off, no start anythig, the battery is ok, but I don`t find the solution for this problem