Onkyo tx sr605 stopped playing music what should i do

If the receiver is indicating "overload" or "protect" there is a load on the system. Turn the receiver off and remove all speakers and wires, turn receiver on and reduce the volume right down, if the word "overload or protect" stays off! it means there is a short in the wiring or one of the speakers. If however the word "overload or protect" comes on when turned on, it indicates a short in one or more of the audio output ic's in your receiver, this is where you will need a tv technician to troubleshoot further. If you not sure about checking it out just call a professional in to have the unit assessed.