Disconnect all speaker connections and rca cables. Leave power, ground and remote wires intact. Try turning on again. If you still have a protection light your amp is faulty. Hopefully you have warranty. Please double check all of your connecons. Mght be time to invest in a vom multimeter. About $20 at Sears. I started their with the same problem long before my engineering degree.
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CHECK ALL YOUR POWER AND GROUND CONNECTIONS, THE SMALLEST PINCH WILL MAKE IT DO THAT.