I had a very similar problem, if this is a digital model (no volume knob) it sounds like the powersupply feeding the amp circuit, eventually it will fail and blow a fuse, on my model i could get it powered back on by unplugging the power connector to the core amplifier board, of course there was no sound lol, but it proved that the short was in the power circuit of the amp, the model i had was a nice system , but i eventually just trashed it, it had no sentimental value like some of my other electronics. if you want to repair it (assuming it is the same type as mine was) you will have to refurbish the voltage regulation circuit for the amp channels, damn high voltage circuits are almost always what causes these types of systems to fail, how many old tv's can you remember loosing picture and sound just to hear a click every time you press power lol and then hunting down a pathetic chip that is only worth like a buck and paying 50+ for it.

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