Hello..my reciever was working fine and all of a sudden when I tried turning it on, it turns on for about 3-4 seconds and clicks and turns back off?

Pull the back off and see if you can see some bulged capacitors if your comfortable doing this, another issue could be bad solder joints on one of the boards, you could try baking each board starting with the power supply board in the oven to see if this corrects it, there are vids on youtube that tell how to bake the boards.

may be overheat - clean heatsilk resolder processor

most of the receivers come with a cooling fan inside see if its working they usually work when you turn the volume up,, if its working that means you are playing it to loud if you lower the volume a little it will play just fine..( if the fan inside is not working thats the reason it goes into protect mode and it means you must have it repaired,, it goes into protect mode to prevent furter damage to the unit or the speakers,,

Either a software re flash may help or a keypad replacement. Usually facial moisture could be a cause of this. i would recommend trying a blow dryer on the keypad for 40 seconds with out the battery to see if that fixes the problem

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.

hardware diffuculties send it back

try another outlet sounds like you may have a short in either your power cord/supply or your outlet is acting up with the wiring

hold down the enter button and the advanced surround button for 5 seconds or so and the amp will restart, the display will come up and hopefully it will be ok. its often caused by using speakers under 8 ohms, or damaged speaker cables etc

You have a bad power supply or the audio output circuit has a short in it. You are correct by saying its probably betterv off getting a new unit. Most likly cost you more then a brand new shiny unit would . Good Luck PS Please do not forget to rate this thread