Well, I opened it and went out. Got in car, hit button...light blinks like there is an obstruction. I press, press, press....cuss. More cuss. I get out and enter code to use external box. Nothing. Now i'm pissed off. I go inside garage, hold down button on wall, door goes down. I exit from door and leave to work pissed now. I get home and realize the left sensor, receiving eye, does not have a light on. I grab the book and it says the door will not function at all if they aren't seeing each other. I figure at this point the wife had to of mucked with it. I don't even bother asking. I grab tape measure..measure 8.*", from ground on sending eye. Go to receiving eye, measure same. I grab a stool and I promise I sat there for 50 minutes trying to find that cock ass beam. NOTHING. The bitch kept screwing with me and blinking from time to time to make me stay longer. At this point, I am ready to rip the motherF'r down, but I drywall'd at fucking wire in, so now what? My damn door won't work. I can't find the invisible beam. My neighbor told me those eyes dont break...they just work. Wht the hell.!!!