i recently bought a 30$ magnavox dvd player. i came home and plug in the red, white, and yellow cords in the correct places on my cable box. i dont know whats wrong but it wont switch over to my movie when i press play. im pretty sure everything is connected in the right spot. i was wondering if i might need another type of cord to plug in since theyve switched over to digital. does anyone know what i might need?