We recently purchased a new house. The living room has a ceiling fan with four lightbulbs. There is a pullswitch but the light is also operated by a flipswitch on the wall with a dimmer. We like the LED white lights so we went and bought some and replaced them. It worked for about a day, then suddenly the light quit working. We tried putting the old bulbs back in but now they're not working either. The fan works. All the wiring looks normals. There is power to the unit. Thoughts?