OK will do. Just for reference the machine has run perfect since you helped out. I make Model Steam trains down in a small workshop down the garden. It got so cold over the past couple of weeks I think it froze the machine, had to put some heat into the machine castings via a blow heater. When I came to switching on the computer the Mach3 setting had dissapeared, frozen out?. Still all OK now, back to my chu chues. Jim