A tripped breaker usually looks like it's between the ON and OFF positions. To reset a breaker, turn it OFF and then ON again. If a service panel doesn't have breakers, it probably has fuses. Fuses Fuses perform the same function as a breaker, except when a fuse blows , it has to be replaced. There are cartridge fuses and screw-in fuses.
Cartridges look kind of like a shotgun shell.
They mount in a little rack that pulls in and out of a bracket Screw-in fuses screw in and out like light bulbs. Some have a glass window on top and metal threads on bottom. When a fuse blows, its internal metal strip breaks and the window may get discolored. Be sure to replace a fuse with the exact same amperage-rated fuse. Fifteen and 20 amp fuses are the most common size ratings.