Thanks for your reply, Dave. Regrettably, it was not the fuse. I’ve taken the lid off, and cannot see anything that looks like damage or eg burn marks. I tried to upload a photo, but the website says I only have 19.5kb available – that is not enough for anything. I have no idea about the main board – what it looks like, where it is located or how to remove it. So I don’t know whether to contact an engineer or scrap what was a good machine. It’s all about the likely cost.