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On the power pack there may be a label that says 12v dc or 18v Dc or some other voltage. There may be a input voltage on the keyboard and a current rating eg 12v DC 1A current or it might be AC voltage of 12V or some value.
get a volt meter or a multimeter and measure the voltage on the plug. positive is the inside part and the outside part is negative. dc setting if dc volts expected or AC setting for if AC voltage expected
Or get power pack tested at a music shop you may have a faulty power pack
You may need to install the drivers to give the computer to fully recognize the keyboard. The computer may see the keyboard, but isn't recogning it fully due to the lack of drivers.
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