I mistakenly put in a dimmer light bulb and, when I pulled the string to turn on the lights, it blew the light fixture of my ceiling fan. I've tried changing the bulbs, but the fixture isn't working at all.
If you mean a lower wattage bulb this would not cause any problems, the fixture wiring may have shorted out tripping the breaker, or causing a wiring failure at a backstab splice. More information is needed to try and help. But a dimmer bulb would not be the cause unless the bulb itself had an internal short causing the breaker to trip or a wiring failure.