I'm trying to help a friend who has a Craftsman garage door opener which just stopped working. According to him, I have not been to see it yet, the main controller in the garage and all the remotes do not work. The main controller is blinking a green light and the unit is humming. He said the light on the unit turns on if he pushes the main controller light button. Therefore, it's receiving power. The only thing I can think of without seeing it is the door is hung up or the motor is shot, since it's humming.
Any other advice greatly appreciated.