Does your garage door go up about a foot?
You might have a broken spring.
Think of the spring as the muscle of the door, with a broken spring it's too heavy for the opener to pull all that weight.
Most garage doors are made of heavy steel and they need a counter balance to lift all that weight.
Some garage doors have 1 spring and some garage doors have 2 springs.
If you have a 2 car garage door, it should have 2 springs.