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There is quite a large topic about this at xda
Any pics? Where's the crack supposed to be, on the button, on the bezel around the button? I don't see any cracks on mine.

Here is the link over to xda, they have a picture where it shows the crack on the (outter shell?) where the button sits. Also, people have reported that it happens on the volume button too.
Power Button CRACK? Check your phone. - xda-developers
