Just bought a house where the bathroom fan is not working. Thought it was the switch but realized the black and hot are not working…. Take a look at the pics as I was thrown off. The switch that does work (switch on the right) has two blacks going to it. The switch that doesn’t work has a white and a black which my mind doesn’t understand. Anyhow, I tried a lamp to both the white and black and that did not light up so what could be the problem? Thx