Why can't turn on D-Chord 168 after charging？

Why some player would turn off automatically after booting screen shows？

Why some player would crash after booting screen shows？

Why can't play music which could be played in PC？

Why some music can't be played in the player, after I place many music in the player？

How to play music in order？

Why the songs information, like song name, singer, displays error words ？

Why can't dlete the file with error words？

Why there is lag or break during music playing？

Turn on the player, play video or audio, and then display "disk error"；
If it shows "It needs formatting" in PC, should I format the player？