If the power flows properly ,all fuses are okay in side the unit ? may be amplifier circuit is damaged .just remove all the wires of out put speakers,chk the speaker by connecting a normal battery cell 1.5 volt to spkr wires and feel the the sound ,if sound comes by connecting bateery cell, means speakers are okay,chk each pair of speaker wires of ur system,if any pair of wire of speaker has any cut of short connection it will nor let the sound come from any other as well.
SOURCE: NAD T762 - no sound
Try reseating the prologic/output board. Second one from the right (from the front of the reciever), that fixed my no sound problems on many channels. You will have to take out a few screws to remove and reseat it, and while you are at it clean the connections.
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