My dvd says open door will not open

You probably need a new dvd belt it is 24.25 mm rectangular. or it could've slipped off. Take off cover and move white wheel with teeth very gently until dvd tray starts to open then you can gently pull on it only pull it half way out and look in center of where dvd would normally be. There you will see the bigger and smaller wheels that control dvd player. look around for the belt. Make sure power is off when you do all this.