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Sounds like a bad relay, the thing that makes the click noise when the amp turns on. It is a small black, yellow, or sometimes clear plastic box. Is the receiver still under warranty?

Next thing to check is fuses, you will have to take the receiver apart to do this. Be sure the unit is unplugged and don't play around on the underside of the circuit boards, meaning leave the circuit boards in place because the fuses should be easy to access. There will likely be 3 fuses. One...

Check for shorted speaker cables. If you have any wires patched check those to be sure there is no short there. Check at the receiver's speaker terminals and at the speaker terminals. If you don't find the solution quickly disconnect all speaker cables from the receiver. If it still shuts off...