my Yamaha home theater A2 amp seems flaky. When I push the on button I hear a click and the panel display lights up. Then after a few milliseconds it automatically shuts completly down. If I keep doing it then it finaly stays on and I hear another cick and the speakers work fine. It sounds great otherwise. What causes the AMP to click offautomatically like that? Everything is hooked up properly I think. Is my AMP finished?