Quote Originally Posted by paulus.v View Post
You said in your first post that
you have:
-replaced the pc (was on it way out anyway)
-checked the ports configured

Did you actually checked that the Port Address of your new pc parallel port matches the one you set in Mach3 (0x378)?
What OS does the new PC run?

Anything newer than Win7, (aka 8.x or 10), and anything 64bit, won't work with the parallel port.