Watch out on a bigger hair, you might pop your eyes
OK, you have a machine and you are using Mach3, AND have some problems.
I also have a machine and am using Mach3 and have NO problems.
You know, I have a crystal ball, but it has not arrived from polishing (yet) so I (we) can't help you 'cause I (we) can't "see" your hardware: parallel port or external motion controller (make and model), and other relevant information that would help me (us) to help you.