Yamaha psr e443 keyboard - cant turn on/ off using power button !?

The power button isnt working. When I plug the key keyboard to electricity , It turns on but the problem is it should wait until I press the power button. And I cant turn the keyboard off by power button, no response though I press it . I have to disconnect it from wall socket directly to turn off it. Also the... show more The power button isnt working. When I plug the key keyboard to electricity , It turns on but the problem is it should wait until I press the power button.
And I cant turn the keyboard off by power button, no response though I press it . I have to disconnect it from wall socket directly to turn off it.
Also the auto turn off feature isnt working .
Keyboard turns off at sheduled time but suddenly turns on again !
Does Anyone can help me ???? Thanks :(
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