Locate the circuit breaker box for your home. In apartment homes, condos and rental homes, ask your landlord to help you locate the breaker box if you cannot find it yourself. Bring a flashlight in case the breaker box is in a dark area, such as an unwired basement or the room in which the lighting failed.
Check each breaker in the box to look for one that is off. Circuit breakers look a bit like sideways light switches. The switches should all be in the same position. If one is in the opposite position, it is off. Look carefully, because some breakers can trip without flipping all the way to the "Off" position. You may have one switch that is just slightly shy of the "On" position. Even so, it is stopping the power from getting to your unlighted room. Most breaker panels also have the switches labeled, so you may be able to find the switch that corresponds with the correct room simply by looking at these labels.
Turn the tripped breaker back on by flipping the switch into the "On" position. If it hasn't flipped all the way to the "Off" position, flip it all the way off, then back on. This should restore the lighting to your room.
Things You Will Need
- Older homes may have fuses instead of circuits. The process is basically the same for a fuse box instead of a breaker box, but a fuse must be replaced, rather than reset. Unscrew the old fuse and replace it with an identical new fuse.