Plug the refrigerator into a wall outlet. If you hear the appliance hum, it likely is working.
Open the refrigerator door. If the light comes on when you open the door, the refrigerator likely is working. If the light does not come on, change the light bulb to see if the new bulb works.
Plug another device into the outlet into which the refrigerator is plugged. If this device is working, the refrigerator should work when it is plugged in as well.
Check your home's breaker box and make sure the breaker switch is in the "On" position. If it is in the "Off" position, slide it to "On."
Move the temperature dial in the refrigerator to any temperature. If the dial is in the "Off" position, the refrigerator will not work.
Open the refrigerator door and feel the temperature. If the refrigerator is cold, it is working.