My problem looked similar and the frame was broken. I suspect thats always the case when the back comes off like in the picture above and here: http://www.mac-forums.com/forums/apple-notebooks/141840-new-unibody-macbook-pro-cracking-hinge.html
since apple only sells the whole cover with display and glass for the price of a used mac, I bought only the refurbished frame on eBay from top-best, realy easy and nice, from China.
to remove the glass is not very easy, and the exchange of the back also needs some study on youtube or here: http://video.answers.com/how-to-remove-the-macbook-unibody-glass-lcd-display-186026885
but its reasonable and I did not have problems
thank you all for help!