Yamaha Ypt 340 problem

[Goodluck2124]

I have a Yamaha Ypt 340. I was playing one day and it switched itself off. Since then it can't power. If I press the power button, it will show light and off again. If I hold the power button, the light will come on but shows nothing on the screen and once I leave the button, the light goes off again with I little sound from the speakers