If the relay clicks on and then off straight away then it might have detected an overload condition and so shuts down. Overloads can be caused by faulty speakers or wiring. But if the damage is done already then one of the main power amp transistors or other devices could be short circuited.
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If the relay clicks on and then off straight away then it might have detected an overload condition and so shuts down. Overloads can be caused by faulty speakers or wiring. But if the damage is done already then one of the main power amp transistors or other devices could be short circuited.