Hi Rhonda, two things come to mind. One, is there any kind of physical obstruction in the tracks, or are the rollers binding in anyway? Two, possibly one of the laser sensors got knocked out of alignment. If possible, remove one or both from their brackets and place them on the floor as close as possible to each other so that they are definetly pointed at each other, then try the opener. If it works, then you just need to realign the sensors, if not then check out the first idea again.