Our Harbor Breeze ceiling fan/lights have been working for eight years. Tonight, we tried to turn on the lights but, they didn't work... tried the fan and it works fine. It's a 5 blade, 4 lights, with pull chains that also work off a light switch. I checked/changed the bulbs but, it still didn't work. Any ideas? Thanks in advance.

I suspect that you have a bad connection...

Turn the circuit breaker off and dis-assemble the fan to get to where the
Electrical connections are made using wire nuts.

Also, check the light switch with an ohmmeter, since it may have failed.

Could be a bad pullchain, or a bad connection in the fan. Check the blue wire in the canopy, and all wires from the lights in the switch housing.

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