Only happens on 1 machine.  Windows XP. I've replaced memory, motherboard, parallel cable, video driver video card and probably a few other things. Only thing i have not replaced is the monitor. But i can unplug the monitor and it makes no difference. I can't make this fault happen. Anybody seen this?

When this happens, all motion and spindle stops. It is as if the cpu/motherboard crashed. Only thing that can fix it is pulling the power.

I turn off the tool path display before running a long bar feed program. Have not had it happen in 2 days. Seems to be a toolpath/memory problem.