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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.
Switch to the other set of speaker outputs (move from A to B). If it continues, you have a repair issue...assuming it happens with all inputs. If it only happens with DVD, or CD, or Tuner, or whatever, but works fine with other components, it's a connection issue - unplugging and replugging, or replacing cables may correct.
If I recall correctly, that unit doesn't have a standard twist knob style balance control. If it does, turn the unit off and rotate it through it's full range several times, then recenter it and try listening to it again.
1-check your input cables from connected equipments(cd player or dvd p layer or any other media source). 2-adjust your input signal level(from-10 db to 0 db). 3-amplifier power must be bigger than total power of all loudspeaker with 20%----(if total power of loudspeaker is 8 watt amplifier must be 10 watt.
this could be the pre amp transistor or the power amp that needs replacing
the pre amp transistor is cheap but the power amp is not
if you did not crank it , then it is probably just the transistor that needs replacing