Electronics Repair Questions? Ask an Electronics Technician
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That is a symptom of initialization failure. It means the control circuitry inside the keyboard is not starting up and getting into proper working order.
The keyboard's circuitry is damaged somehow. The keyboard will require repair-servicing, almost certainly.
If you need the location of a Yamaha Authorized Service Center (or several of them) near you, please state your locale (by zip code or by town/city and state), and I will give you listings for it/them.