If you open Mach and then go to the Operator menu and choose VB editor. In the editor type in
ActivateSignal(OutPut4)
and then press the green arrow, your output should now be active, to turn it off again change the above to
DeActivateSignal(OutPut4) and press the green arrow it should turn off again.
Not sure if you saw my last post regarding the loacation of the M6Start.m1s, also is it named as that or do you still have M6StartGraham.m1s? If you do then that could well be the problem.
Hood