Diplomat ADP8332 Dishwasher won't work?

This dishwasher was fitted in the house when we moved in 5 years ago - it has worked, then stopped, after we checked the fuse in the plug it worked again, but then after a power cut it didn't work and hasn't worked since - we have had the plug checked that works and the socket however the socket does show no earth. Is there a fuse inside the dishwasher (it is integral) how do we get to it ? Will it ever work again ? Is it worth getting an engineer out - we don't know one - can anyone recommend somebody.