I have a grbl board sainsmart sent by mistake when I tried to make it work I couldn’t get the machine to do anything other than light up the board . Tried candle but I’ve not any experience with this type of thing getting it to connect to the laptop. I put the new board that runs drufel on yesterday and everything works just like the old board did-the surging motor . Any help or advice out there for the other grbl board jic I need to change out later on