I plugged it in and its the right adapter(DC 9V) for the keyboard, I've been moving it around and stuff for a while, but it won't work.
I assume the keyboard you are referring to is a musical keyboard and not a computer keyboard and the DC 9V is the power supply for it. With those assumptions, though you have the correct voltage, DC 9V you may not have the right polarity. Look at the keyboard connector, verify the polarities of the inner and outer connector. For example, the 9V adaptor, on the back of it, it should have a + and - these are then shown as the inner connector or the outer connector, make sure this is the same image on your keyboard. If you have doubts, take the keyboard and adaper to your local radio shack.
