The light on the Matrix will always stay green even if its not working. It only flashes red or orange or whatever when you have it in test mode or write enable. I suggest you download some of the PDF docs that explain how to use it. You can find them virtually wherever you can buy the Matrix chip. ...Explains all the settings. Also, (explained in the PDF) its best to switch the Matrix to the mode you want it in while its on, turn it off then turn it back on again. So if you have it in test mode to align it correctly, once you get it alinged, switch it to the mode you want then turn it off. Don't ask me why,...just what they recommend.