Quote Originally Posted by Poisson Du Jour View Post
A warped screen frame, through exerting too much pressure during re-seating, is the most likely cause.

Echoing a previous post, investigation and remedy is not a DIY task and is best left to a service centre.
Actually changing out the screen is in fact a user task. When you buy a replacement screen the package even comes with a little tool to unseat and seat the screen...it is very easy. I have found that the use of this tool is optional. Unless an owner is very, very incompetent to easy mechanical process I would not suggest going to a pro shop.

Now of course if we're talking about a damaged camera, then of course a factory rep or a camera pro would be the best bet.