Dear Liz,
If your Kindle presents some horizontal or vertical lines in part of the screen, or even in full screen, and if the image is kind of "vaporous", not bright, it might have happened that you have a broken display (maybe due to pressure exerted on it, by something inside your bag, backpack or wherever you carry your Kindle). Please check this link to see if your problem is similar to those portrayed in the following images:
https://www.google.com.br/search?q=broken+kindle+display+image&client=opera&hs=72G&tbm=isch&tbo=u&source=univ&sa=X&ei=hsZ5Upr2PMrqkAez1YHwCw&ved=0CCgQsAQ&biw=1280&bih=730If that is the case, you can buy a new display from Ali Express and replace it following the disassembling instructions shown at
http://www.ifixit.com/Guide/Repairing+Kindle+3+%28screen+replacement%29/11938If you do not want to do it on your own, take the display and the instructions provided in the link indicated to a repair technician that you trust and have it replaced (I had the same problem with my kindle 3 and replaced its display in less than an hour - it is not that difficult...).
Hope you may find this information helpful!
Regards,
Miguel L. Martins
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