it looks like the prongs that pinch the bezel aroind the lcd came loose.

you should be able to just take your device apart and GENTLEY bend the prongs tighter again, or at lwast get a better look at it.

it could also be as simple as a loose or lost screww as there is one right there in the corner to hold the backing to the diplay.

here is a link to a dismantle youtube vid
http://www.youtube.com/watch?v=aVEHm325-z8