Turn off or unplug as many appliances and electronic devices as possible throughout your home. Go back to the circuit breaker and flip all the breakers off. Turn the main breaker switch on and off several times, finishing in the "on" position. Then reset each of the breakers, one at a time. If this causes the main breaker to trip or if you are unable to reset one of the branch breakers, you'll know that you have a problem with that circuit, which will need professional electrical repair.
