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 'naked'. 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.
Resetting the system
Use this procedure to reset all the receiver's settings to the factory default. Use the front panel
controls to do this. Set MULTI-ZONE to OFF.
• Disconnect the iPod and USB memory device from the receiver beforehand.
1 Switch the receiver into standby.
2 While holding down ENTER on the front panel, press ?µ STANDBY/ON.
The display shows RESET < NO >.
3 Select 'RESET' using PRESET +/-, then press ENTER on the front panel.
The display shows RESET? OK.
4 Press ENTER to confirm.
OK appears in the display to indicate that the receiver has been reset to the factory default settings.
• Note that all settings will be saved, even if the receiver is unplugged.
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