I have installed the Mach3 program on a second computer with no problem. I coppied my XML file into the Mach3 folder. When I turn on the computer, Mach3 loads correctly and in the config pins and settings, everything looks exactly the same. When I jog the 3 axis, the motors move very slowly and have a chattery movement to them. If I try to rappid, the motors make a high pitch noise and will not move. I played around with motor tuning, but that made no difference. My printer port is set correctly. What might be causing this problem?