Cathal McHale, here is my answer to a very similar question "I would get to the "tummy switch" and check the circuit from there. You do have a couple of choices here. Check the switch, then the speaker. Check the connector for both. You will need a multimeter to check those. Follow the schematic to work on your Furby's voice, and check on here for directions on how to skin the Furby. Hope this helps, good luck.