Hello, Try unplugging all of the speakers and then power it on again. Does it shut back off? If it stays on, try reconnecting the speakers one at a time and make sure the speaker wires are not touching each other. It's posible one of the wires is shorting out, perhaps a stray strand of wire is touching the other wire. If it still shuts right off, there's a possibility that the output transistors on your Home Theater Receiver are shorted and need to be replaced. How old is the unit?
it shuts right back off. i bought it July 9th 2009.
what does the output transistor look like
It should still be under warranty then- I would'nt even open it up...I would contact RCA and get a return authorization number to send it in for warranty repair. If you're still curious, the output transistors, are little black "square" chips that would be bolted onto a heatsink of some sort towards the rear of the unit.