Potterton Performa 28i seems to have no power?

Hi all, my Potterton Performa 28i seems to have died completely - none of the status lights are on, the pilot light is out and there is no heat or noise from it. I have checked the obvious things - reset using the front switch a couple of times, changed the plug fuse, checked the socket is supplying power & checked the fusebox. I am therefore assuming a fault in the boiler - any suggestions?