Short circuit? The second flip is probably the output disconnect relay not engaging because the circumstances aren't right. Check for a short, see if that fixes it, if not, it may be an internal problem. Overloading would attach the speakers until the overload condition was found then disconnect them. The speaker switch might be disengaged....if it has one. If all these turn out to be okay, and you disconnect the speakers and it still won't send output to the relays, then it's a problem with the receiver. I don't know this receiver, it might have an internal shutoff to the power amp section.