Sue, Find out if the motor is operating. You can detach the door from the track. DO THIS WITH THE DOOR DOWN!!! If there is no tension on the door it will drop if released while in the air. There is usually a cord hanging down from the track close to the door that will release the door from the track. Once you have pulled this cord check to see that the door operates freely and smoothly by lifting it and closing it. If it does not then you may have to check the springs that adjust the tension on the door. Push the button on your wall. Does the motor run without the door attached? If not, check power to the unit. Plug something into the outlet to make sure it works. There is a beam on newer garage doors as a safety feature to keep the door from closing on things. It can be found on either side of the garage door near the floor. Make sure this beam is operational. A solid light means that the beam is clear. Blinking means that something is blocking the beam or you need to adjust it so the two sides point directly at each other. The beam has to be clear for the door to operate. I had to clean the lense on mine to get a clear signal. Try these and good luck.