I run a 3 axis router with Mach2 and now Mach3 for 2 years now without any big issue.
After some good parts machined the long axis started to sudden invert its direction and shortly after that the power supply of the PC quitted.
It is maybe two unrelated problem. I changed the power supply today and the PC came back to life. buth the router y axis is still arratic in the direction it choose to go I checked my paralel cable and it is ok.
Any clue could be of great help.