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My Celviano AP-650 is almost 3 years old and now the E and F keys below middle C make a very loud vibrating sound when held down. (like a helicopter).  I've tried setting the backup to ON but it does no good.  Any suggestions would be greatly appreciated as I play my piano every day and this is just painful.  I live in Western Washington.

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Hi and welcome to the Casio Forums. The only thing I can suggest is to try unplugging it for 5-10 minutes and then give it another try. Sometimes cycling the power like this can clear a glitch. I will say, this is a Hail Mary and your piano probably needed servicing. If you need help finding a service provider, let me know. 

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