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Disconnect all the speakers, and then check. Connect the speakers, one by one, and find which one makes it overload. That speaker is faulty. If you wish to get some details; check the site linked here. Pull up older posts. http://electronicshelponline.blogspot.com/
Generally speaking, an amp attempts to protect itself from heat, shorts, overloads and operator exuberance by refusing to turn on or stay on.
Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up.
You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.
If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.
If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'nekkid'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech.
Make sure that the sound field/programme you have selected is dolby digital not stereo.(On the amp)
You also need to check on the display that is says DIGITAL not ANOLOUGE, as only a digital input, Optical fibre cable, HDMI, COAX will be a digital signal.
If you are using red and white rca connectors, it is not going to work, as this is an Anolouge signal.
I had the same problem and resolved it last night. You'll also need to connect an audio cable (EVENTHOUGH YOU SHOULDN'T HAVE TO - to bad pioneer didn't fully implement the HDMI standard in this receiver) solution. I suggest using an Optical cable. This really annoyed me...see the manual on P.17 section #3.