I love my PX-130 and decided to try to hook it up as a MIDI controller. I plugged in the USB to a Mac and it made 2 other devices on the USB hub brown out - got a warning that the device was pulling too much power. I tried hooking it to a Windows computer and it said that the USB device malfunctioned and could not be recognized. I have tried several different cables, using a USB hub and plugging directly into the computers without success. I do have a microKORG running as a MIDI controller, so I know the software on the computer side is fine. I suspect the Casio end of this has malfucntioned somehow. Not sure if there are replaceable parts in the USB controller or if I should send it in somewhere for repair. Any help that you could give would be greatly appreciated.