[Leslie & Nick]

You should at least hear the water pump when you hit the switch - you might not get any water right away, but you should hear the pump. I would guess you have a bad electrical connection, or the pump itself is faulty. If the fuses look OK, check the connections at the pump like someone suggested, if they look OK check the wiring behind the switch (at the sink). The wiring is easy to get at, and it could be a wire simply got disconnected from the switch. A longshot, but I guess the switch itself could also be bad (but I doubt it-I'm betting on a loose wire somewhere).