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Hello, have you tried unplugging the unit for several minutes? If not, try that first. The clicking is the relay on the control board. The board has most likely shorted out causing this issue. Hopefully unplugging the unit or flipping the breaker off for several minutes resets the problem.
Yes, the board is bad. You will need to replace or have the control replaced to fix this issue. A microwave can hold lethal voltage even unplugged. I work on the honor system here @ Just Answers. Please remember to rate my answer positively before logging off. Thanks!