I have a problem with my Bridgeport VMC 760/16 TNC2500B&C Heindenhain. When i try to start the spindle it sends a message error " machine guard not closed " , this start to apear after i lost the parameters, i've put them back from the book, but...this message keeps show everytime i truy to run the machine, can't do nothing. If someone could help me with a paramater for machine guard...i would apreciate it. Thanks.