My smoothstepper is not working. Only the blue LED comes on , When I plugged it into several different computers ( usb ports ) , the computers do not make a sound , and 'smoothstepper' does not appear in their device manager listing. I have the voltage jumper set to USB power. It worked fine at first. It was hooked up through a CNC4PC breakout board. I emailed this data to Warp9, several days ago , have not heard back at all. I am amazed that there are still no trouble shooting docs, just blank pages ! Any information or suggestions appreciated.