Thanks for replying Hood, but sorry, to me that sounds like you are speaking Swahili.
All I know is the machine has worked flawlessly for 12 months before this happened. So I'm guessing the hardware set-up is correct and I have a software problem.
Unless... while the machine was running I used the drill press. Would starting that have caused a voltage fluctuation that may have corrupted a file?
I really don't know what I'm talking about so I'll accept any advice I can get.
Regards, LC