Hi on my new Kenwood Prospero+ model khc29h0wh (but applies to all) I had same problem: dough mixer and high speed mixer working, but "medium speed" food processor and Juicer not working.
After lots of time I realised... the lid of the Juicer/Processor actually locks in three different positions, but only one of these (with the handle corresponding to a mark) actually locks lowering a white plastic security prong that activates the switch. It is the position in which the lid and container prongs coincide.
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