It sounds like you may have a problem with the eyes at the bottom of the door jam. These two eyes must be aligned so the light from one is picked up by the other one. Sometimes they get bumped by accident and need to be re-aligned. Check at the top of the eye where it is touching the metal bracket. If it has been moved the plastic pin on top of the light sensor will be out of the hole in the metal bracket. carefully move the plastic light body until it snaps into the hole on the metal bracket. Then try the remote. If that doesn't work, check both boxes on each side of the garage jam. one should send out a light beam and the other one should receive it. Try this. In the dark put a piece of paper in front of the unit that is NOT sending out light the beam. Line up the light beam with the receiver hole on the side of the unit. move it around until it shines into the eye on the side of the other unit. Try the opener. See if solves your problem. If I get to a point like this where nothing I try works I get out a tool that always fixes anything, my checkbook. Good luck. :)