Smeg Slimline Integrated Dishwasher - Not Starting?

I have an integrated slimline Smeg dishwasher that has suddenly completely stopped,the control panel shows no lights.
I have checked the fuse to the spur which is ok and am at a loss as to what the problem is. My wife mentioned that the machine made several clunking noises one day last week and checked to see if the spray bars were hitting a plate/pan etc - they were not and the noise subsided a minute or so later. All worked normally until today.
Any help would be more than welcome - unfortunately the manual is no help and doesn't even quote the model number!
Thank's in advance