Hi Clive.

Thanks for your response. This is where I have to reveal the depth of my ignorance in so much as I have no idea where to find the config files! The machine was configured for me by the gentleman that I bought it from, and it's running Linuxcnc 2.7.0.

The closest I can come to a picture of a control box is this:Attachment 28129

The card in the centre of the picture takes the input from the PC.

I've now been in touch with the chap who put the machine together and am doing some more faultfinding under his guidance. It appears the problem might simply be a fault on the PC combined with my ineptitude!

Thanks for your interest and I'll post an update as soon as I've got any further progress/information to report.

Are you in the South Wales area?