I'm a total novice, and need help! I have a dimmer switch with Halogens - installed in the flat when I bought it. The dimmer recently gave off a wonderful blue spark and tripped the system - and now the light switch doesn't work at all. I'm guessing I have to replace the inside component of the light switch (is it a transformer?), but I can't find anything on the web. Does anyone know where I can find such a thing? It's a cuboid, about the size of a thumb. Thanks (hopefully).