Yamaha CLP-560 does not start .

My Yamaha CLP-560 was inadvertently left on for .... who knows. When discovered that it was left on but was no longer alive and would not start up again. Months/year later upon pushing the button, low and behold, it fires up and I begin to play. I am so amazed by this fortunate turn of events that I am compelled to test it. Turn it off and on again once, twice (so far so good) but the third try bears no fruit. So is that a faulty switch or, more likely a burnt power supply. Or something else entirely. Either way open to suggestions while looking for the solution.

Thank you, Chris