Hi all, my Kindle 3 (WiFi only) developed the same problem. Never dropped it or shook it, just after 3-4 days of bliss I picked it up and heard the loose-piece rattle inside. I saw the Youtube video posted, and as someone with a long history of taking things apart was confident enough to do the same.
A few comments for those who wish to try (watch that video):
1. It takes a while to work the case off, be patient. I used plastic edges (laminated card) as much as I could to avoid scoring the plastic with a knife (or inserting it too deep and shorting something).
2. Do it over a clean, light surface. The loose screw is very small, black, and will probably fall out the very second you get the back case to come off, like mine did.
3. It's not the only screw you need to worry about! I had one screw escapee, but I would say 3-4 other black screws were in various stages of working themselves out. As mentioned, you need a jeweler's screwdriver (often used for eyeglasses too). The tip of a small knife blade might do it. In my opinion, the screwholes are not stripped; they simply did not screw these in all the way. I tightened all the black screws until they felt taut. I advise once you tighten them all, try applying a *light*, low-pressure turn in the other direction to see if it loosens. If it loosens easily then the hole may be stripped and you may be better off just removing the screw entirely. If it requires pressure to turn, you should be good. Mine all tightened well, including the loose screw back into its missing spot. YMMV! All of the screws seemed to be on the motherboard in the lower side of the device away from the battery. All of the larger silver screws were tight on mine.
Opening the case is risky. If you have any doubts then I recommend wait a few weeks for Amazon to get through their 'bad batch' of product, and return it.
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