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Since you state that even the blower fan doesn't turn on, and the breaker has been replaced, your focus should be on determining if there is both 12 volt and 120 volt power at the a/c unit. A trip to the roof is where you will probably have to look. Without proper knowledge or test equipment, your investigation will be limited to looking for and smelling for, burnt wiring.....or the start run capacitor (which is usually a dual type that supplies a starting circuit to both the compressor and the blower motor) can sometimes give tell tale signs that it has failed by manifesting a domed top where the wires are connected. Poor voltage and voltage spikes are capacitor killers.
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