It wouldn't matter which way the green light / antenna booster is set when watching a DVD. The DVD is typically connected to the tv with a HDMI cable. On the TV remote you should see a Source button. When you push it you should see several choices like antenna, HDMI 1, HDMI 2 Etc. With the DVD powered up you should select HDMI 1 and see if it says "no signal". If it does, move on to HDMI 2 and see. One of them should show the DVD signal or splash screen.