if it's still clicking off, it's going into protect mode. probably a pair of output transistors shorted, as well as a few other components burnt. with Onkyo amps and receivers, once the problem is repaired, it will stay on when you turn it on. Pioneer and some Yamaha receivers are the ones that need a protection override reset (a factory default reset doesn't clear this, since both Pioneer and Yamaha require several minutes of stepping through menus to clear the protection history).