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If a light bulb has gone out, check the socket for loose connections. When a bulb in a stationary fixture fails to light, check the electrical wiring with a multimeter. If the bulbs are blown, the wiring may be the culprit. A professional electrician can check the wiring for loose connections. If a circuit is overloaded, an appliance could get an electric shock. If a circuit is overloaded, contact the power company to determine the source of the problem.
Troubleshooting an appliances requires first identifying the cause of the problem. This requires you to use your senses to find the problem and evaluate the cause. Check for any burnt or oily elements. Also, look out for other external factors that may be affecting the appliance. The symptom may disappear, but that does not necessarily mean the problem is solved.