My new Marantz is working fine except for one little problem. About every other time I try to turn it on it will act like it is powering up and after 10-15 seconds it shuts down and the Warning Lamp Light comes on. I then have to unplug the power cord and plug it back in and try powering it up again, it will then come on. I tried tightening the screw holding the cover for the lamp on the back, taking it off and making sure it is on good and no luck it still does it. Do I need to take the whole lamp assembly out and reseat it?