Fan has two pull chains (fan & lights) and a toggle switch along bottom circumference. Fan works but lights do not, regardless of pull chain and toggle switch positions. Everything used to work (2-3 tears old). Light bulb is good.

Black w/white wire or blue wire at ceiling should have power, goes down to light pull switch, has 2 wires, bypass to see if switch defective. White wire from light kit need to connect to white.

Could be a bad light bulb, bad connection in the light socket, bad pullchain, or a loose wire in the switch housing or ceiling canopy. Trace the current from the supply to the bulb and back.

General ceiling fan troubleshooting and help FAQ- Ceiling Fans N More