Drizzt Do'Urden

i've searched a bit for it. I finished work, as always, i get in my car, start it. This time, the screen just didn't pop out. when i press the button to get the screen out, it does makes the ''ping'' sound. when i press again, i doesn the ''pong'' (lol) sound it does when it usually bring it back, but nothing hapnes. i have the sound of my DVD, all the buttons are working, i can use the radio and the remote.... any idea? thanks a lot guys! Drizzt