What are you all talking about electronics? :O Isn't that just a simple transformer, a Fuse and a Switch? If so, I'd say, eather the Transformer has a fault, maybe the built in termal fuse, Primary windings or Switch. if not, I am absolutely not sure. Than s omething in the upper section could be wrong. Can you screw it open and post a picture of the lamps upper section after screwing it open?