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I REALLY doubt there is anything wrong with the screen. Not sure if its hardware failure or firmware failure. Have you tried loading pictures and pdf files? If they still work, than it is definitely not a screen problem. If that still doesn't work and you're willing to bend the rules a bit, you can also try jailbreaking and installing Duokan on the device and try the picture viewer in there and see if the problem still persists.
If you have pictures working in ANY of those tests, you might just have corrupted firmware and reinstalling the firmware might just fix it. Another problem might be actual problems with the screensaver pictures. I once had power problems with my kindle which resulted in corrupted screensaver pics when I managed to fix it. If you install the screensaver hack you can take a look at those too.
If you do end up doing something like installing firmware and the jailbreak, there is a small risk of messing up the system if you do something REALLY stupid and don't follow the instructions closely, so be aware of that if you try.
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