The wires inside the cord are broken or frayed. You have to get another cord and wire it in. It is not hard. You have to take the speaker box apart - probably just screws. The wires may go to screw terminals, which are easy. But... you MAY have to solder the wires onto the circuit board, and unsolder the current wire. It is not hard, and I'd be happy to do it for ya, but I can't reach that far!
