I am trying to add a light kit to an existing ceiling fan. I connected the two wires from the light fixture (black and white) to the two wires in the fan "for light fixture" (blue and white) White to white and black to blue. I then turned wall switch on, and no light... I tried pulling the chain, changing the bulb, even trying it on another fan in another room. This seems like a simple project, but I am stumped...