Im having issues with my garage door opener. I had to go out and buy a new drive gear and what not to fix it. I got the old one out, and put the new one in. But now, when i hit the button to open/close it. it will go about a foot, stop, and go back to where it was. I have the limits set to where they need to be, the sensors should be aligned, connected, and nothing obstructing them, so i can't figure out what the problem . If any one has any ideas, or help what so-ever, it would be appreciated. Let me know if you need more info.