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Electrical sparks coming out the back of your microwave is a serious problem. This is caused by food buildup, which causes an arc from a microwave part called the high voltage capacitor. The arc goes from the capacitor terminal to the "ground" of the microwave. Chances are, you now have some burned connections that will need to be fixed. You should also clean the food debris, and make sure you stay on top of cleaning in the future. If the sparking problem persists, you run the risk of causing greater damage to the machine.