I recently purchased new mill, and have spent a long time on the phone with the mills support person. My problem is that Mach3 does not recognize the mill controller at all. The offline light just keeps on blinking, no response from the mill at all. My computer is new but its not a dedicated computer. I'm just trying to get the mill to start up. My computer did not have a parallel port so I installed a parallel card. I've gone to config, ports and pins in Mach3 and set my port address to DF00 which is the ports address. Mill support tells me that Mach3 will not recognize DF00 as a valid port address, which is why Mach3 will not recognize the controller. I did try 2 other computers. Another desktop with same port address, and a laptop with a 378 port address. No response on any of them. This is my first experience with a mill and Mach3, and I'm just wondering if this sounds like a port problem to you. Any input is appreciated.