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CASIO CTK-800 turns on but no keys work, and then the power key will not turn it off. I have tried all of the trouble shooting solutions, i have tried different dc adapters, and nothing works. None of the keys work, for no apparent reason.

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That doesn't sound good. It sounds as if the processor is locking up and that might only be fixed by replacing the main board. Sometimes this happens if a unit gets fried by static electricity.

But before giving up, I would open up the unit and check for loose cables and connectors internally. If there are chips (IC's) that are socketed on circuit boards, push them down firmly. Things may start working again.

Posted on Jul 02, 2009

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Posted on Jan 02, 2017

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