How to Troubleshoot a Non‑Lighting Light Bulb

If the bulb doesn’t light, the first thing to check is the bulb itself—whether it’s burnt out or broken. Remove it and install a known‑good bulb of the same type. If the new bulb still doesn’t light, the problem may be the socket or the fixture base.

Next, make sure the switch is turned on and that the circuit hasn’t been tripped at the breaker. Look at the breaker for any tripped or “off” positions. If a breaker has tripped, reset it, but if it trips again immediately or repeatedly, stop and call a qualified electrician.

If you’ve swapped the bulb and verified the switch and breaker are fine yet the light still won’t turn on, cease any further DIY work. Opening walls or tampering with wiring can be hazardous. Contact a professional electrician to safely diagnose and repair the issue.