On the chute where the grass comes out there is a black piece of metal under the edge of the deck held on by the 2 big thumb screws is probably bent. You will need to try to move the blade on the side near the chute by hand (Make sure the mower is not running when you do this) if the blade touches the black piece of metal it will kill the mower if you engage the blades and try moving forward. Anyway you need to take the black metal piece off and bend the corner out of the way (I used a crescent and clamped it to the hitch on my pickup). I am guessing i went over something like a street curb with the deck when it was to low and that bent it. Now when ever I move the mower from someones yard or drive it across the street I always raise the deck up all the way. I hope this helps