If you have set up the BoB OK with 12-24v GND and 5v from the PC using the USB cable AND the jumper on the BoB is off, AND ports and pins are set properly in Mach3, - then if your BoB is working it should work.

At the moment I am very pissed off that I have to rebuild my system from square 1 as after the hard drive failure, I have to reload all software. Fortunately I backed up all the work files but the Mach3 .xml has been lost and I thought I had a backup, but can't find it, so it looks like I have to go back to basics. I was up till 4:30 this morning trying to sort it, so I think today will be a 'FCUK It' day.