my initial problem was with the down command button/s. the only way to get the door to come down with the opener was to hold the push button down and keep it down until the door was closed. after attempting to adjust with using the knobs (the white an black ones) at the bottom the bottom of the opener itself, the door closes without having to hold the button down, however when the bottom of the door touches the garage door it immediately goes back up. any suggestions?