Problems with my imac screen.?

Not to long ago my friend move his imac desktop from his dorm room to his house by setting it in the back of his car. Since then his screen has been damaged. When you turn on the computer the lower half inch of the screen is discolored. The glass covering is not damaged but that section of his desktop screen in black and messed up. How should we go about getting this repaired? I believe his apple protection is no longer active so we may have to go to a third party for repairs.