I have went through all the cables, and connections. Even tried some new cables. I have full movement and control over the table. The power lights are on. I am getting a series of lights when I put it in test mode.....UP and ARC ON flash three times, then it switches to DOWN and ARC ON for three times and repeats. I feel like it is a communication issue and have checked out the serial/parallel port settings and compared them to the Mach manual. I thought it could be a software/driver issue too.....