No Power in Wires

I recently replaced 4 light switches (3-way switches) to a kitchen light and hallway light. They are in working order and function properly. My range hood, over the oven, stopped working. I pulled it down and found that the wires leading in from the wall, do not have power. The oven range is on the same circuit as the kitchen light. All lights on the circuit work properly, except the oven range.