I have never once had a problem adding books to any of my kindles, but now I am. They are in the correct format (Mobi) and updated as well. It keeps saying "Cannot Copy Item, device may be disconnected" or something to that extent. Also when its plugged in it says whole thing is empty and it's far from being empty. Like no files, no pictures nothing.Did i waste my money buying a new kindle? My previous version no longer charged, something wrong with the port.