The music files may not be playable because of different formats and encoding bit-rates. Similarly, the photos may be of low resolution or too high resolution for the system to support. Please contact the Philips Consumer Care centre for further assistance or to find more information related to this issue. You can find the contact details on the Consumer Support page. Make sure you have the model number and the serial number at hand when you call us. You find these numbers on the sticker at the side/back of your product.