I already have one machine controlled by the Mach3 software which runs without any problem, this is run throuh a HP desktop PC.
I used the same compressed file to load programme into a Dell desktop PC, Mach3 programme loaded fine.
I duplicated all the settings from the one that is running fine, double and triple checked.
I created a programme using artcam software, created the G-code file. Loaded that file into Mach3. Clicked on the start button and the machine responds to the commands, until it gets to line 997 of the G-code file then the Dwell light flashes on the Mach 3 screen.
No message comes up it the message box at the bottom of screen.
Swapped over to the HP pc and the same G-code runs fine.
Hope there is enough detail for you, and many many thanks for your reply.
Jona