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first you must check if your portable loads cd or mp3. If it loads cd or mp3 the defect is lens and this should be replace by an expert. If both cd,mp3 and dvd didn't load you check first the ribbon wire for signs of disconnection and foldings and then replace it. If still your portable didn't work the most probable defect is MPEG board.To distinguish if MPEG or lens defect in lens shows malfunction such as not reading dvd but reading mp3 or cd, unwanted stop of play even with a good dvd.