My son put a DVD in the player, then it said rear locked on the screen and it wouldn't do anything. No matter what button you push it says rear locked, and you couldn't turn it off. So I new that if I turned my power button off on the radio always used to turn off the DVD player at the same time. So I did and it turned the DVD player off but now I can't get it back on or the DVD out. Does anybody have any clue what might be going on?