[header] How to fix fluorescent light humming [title] Unplug the unit or flip the breaker off if it is directly plugged into the wall. [step] If the light is permanently connected to power, shut off the breaker. Do not disassemble the unit without disconnecting power. 
[title] Remove fluorescent tubes and set safely aside. [step] Make sure you don't break them! You can put them off to the side.