I just replaced two sconces above my stairs. One of the sconces is working, but the other is not. I checked the connections and bulb, but nothing fixed it. So then I tried to reinstall the old fixture which had been working previously, and it also won't turn on.
The sconce that is working has two black, two white, and two ground wires in the electrical box. The one that's not working only has one of each. Both lights are on the same switch if that information adds anything to the troubleshooting. Any thoughts on what could be causing the sconce to not work?