Solution #2 is right. The green light informs you that the beater brush is spinning. If you are vacuuming a bare floor (such as a kitchen floor or hardwood floor) you would want to have the beater brush disengaged by turning the belt lifter handle (found on the front of your vacuum head) all the way to the left until the red arrows line up. Now when you run the vacuum you won't see the green light on because the beater brush is disengaged. When you are going to vacuum a carpet then you would want to turn the belt lifter back to the right so the green arrows line up. Now the beater brush should spin again and the green light will be on. Solution #2 is right. The green light informs you that the beater brush is spinning. If you are vacuuming a bare floor (such as a kitchen floor or hardwood floor) you would want to have the beater brush disengaged by turning the belt lifter handle (found on the front of your vacuum head) all the way to the left until the red arrows line up. Now when you run the vacuum you won't see the green light on because the beater brush is disengaged. When you are going to vacuum a carpet then you would want to turn the belt lifter back to the right so the green arrows line up. Now the beater brush should spin again and the green light will be on.