SANSA E200 NOT SHOWING THE MENU SCREEN

Question

Hello! My name is usman . I've been using sansa since one year but now it suddenly does'nt work at all .Whenevr , i power on sansa e200 ,it just shows the letters '' SanDisk '' and then suddenly the screen goes bright white and sansa e200 restarts again and follows the same step again and again .it does'nt show the main menu screen and with that result it can not be connected to the pc and cannot be identified by the pc too.What should i do .Plzz help me solve this problem and to get my sansa fixed as early as possible.