Power is On, but nothing is displayed.
  

Check if the program cartridge is properly inserted.

Should the cartridge is properly insertred, ask for after sales service.
 

15 | 2/2    
5 After Service   How to use After Sales Service? And how long? [2] 4022
4 Product   Backlight does not work. [2] 3929
3 Product   Display is too dark. 3456
Product   Power is On, but nothing is displayed. 3403
1 Product   Power doesn't work. 3117
     [1]2