Yamaha Montage 8 keyboard failure to power on

Good evening my people.
Please, after playing my Montage 8 Yamaha Keyboard for event and shot down , coming the next day to power it on, it could not power on. After assessing it, I observed that the main board is faulty, WHAT SHOULD I DO TO RESTORE THE MOTHER BOARD OR TO MAKE IT POWER ON?. Please, I need help indeed.

Best Regards
David Azubuike (DAVAZ)