Hi and thanks for the response.
Yes I think I'm going to try and see in the desktop computer first as I know there is one in there and swap it out and see if that works, problem is there is basically 3 computers in there, the `brain' of the CNC, the computer that sends it the code and then the desktop that enables me to program it. So hope it is the desktop as looking at the other two I have no idea where to even begin.

Cheers