Thanks for the reply.
I'm actually away this week, so not able to get in front of the machine, however the computer boots up fine. Mach 3 loads OK as far as I can tell, although apparently it has lost some settings ( not sure why ). I'm not able to establish if it's these settings are the reason for stopping machine from working, or if there's another more fundamental problem.
I think it will load a G code, but literally nothing happens.
Will be able to provide more detailed answer next week. Let me know if you have any other questions, that may help solve this issue.
Thanks very much for your time.
Richard