Plz help, the piano when I connect it to the power it's go on but when.i press the button to put off it can't, unless I plug the adapter out, second,the LCD screen.it not showing anything.when.i press any button,it's only stuck on Yamaha,no button.is.working,last I did a factory reset.and it's ask for update s ,and say no file,plz what can I do to save my keyboard it for church,