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The reason why this is happening is because the reciever is going into protection mode due to a short circuit to the amplifier. It might be a speaker that is shorted out internally or there might be some speaker wires making contact with each other at the back of the reciever or at the speaker. The first thing I would do is disconnect all the speaker wires from the back of the reciever(make sure to label them before removing so you know how they go back). After removing the speaker wires turn on the reciever and see if it goes into protection mode. If it does then there is a good possibility that the internal amplifier might have a short. If it does not go into protection mode then that is good because there is more than likely a short on one of the speaker wires or speaker itself. Now connect one set of speaker wires at a time. After you connect each one try turning on the reciever until it goes into protection mode again. When it does you will have your culprit. Then try swapping speakers with that problem wire set and see if it still does it. If it does then it could just be the wires but also switch the wires to verify that the amplifier does not have a bad channel. If swapping both the wires and the speaker swapping produces the protection mode then that channel for the amplifier will be defective. I hope I have not confused you too much.
The reciever will go into protection mode when there is a short in the speaker wires or the amplifier was overloaded. What I would do first is verify that none of the speaker wire connections are loose at the back of the reciever or at each speaker. And verify that none of the wires are making contact with each other. Then label each speaker wire as you remove them from the reciever so you can re-install them correctly. After you have disconnected the speaker wires try unplugging the reciever for 10 to 15 minutes. Most recievers have a self-resetting overload protection switch and this should reset it back to normal. Now try plugging the reciever back in and turn it on without the speaker wires connected. It should be out of protection mode now. If it is still in protection mode verify that there is not a reset switch somewhere on the back of the reciever. If it is not in protection mode now then proceed to connect one speaker set at a time and turn on the reciever to see if it goes into protection mode. If it goes into that mode after connecting a speaker then that speaker is the cause of the problem. If it does not go into the mode after all speakers are connected then try turning the volume up. If it goes into protection mode then there could be an internal short on the amplifier or a incorrect OHM rated speakers connected to reciever. Verify that the speakers are rated the correct OHMS.
The amp is not geting enough current.You need to use some larger gauge cable and it would probably be best to add a small power capacitor.If your not familiar with a cap then stop by your local car audio store or google it and you will get a lot of imfo.
you have a faulty circuit somewhere, whether its in speaker wiring, or power source, i dont know, but your reciever has an automatic circuit breaker in it for protection, and a faulty circuit will trip it, i would assume it is a power source problem since it wont turn back on, check wiring, plugs and look around, and smell for burnt, or hot components.