LCD display screen isn't working

My Sony Cybershot p100 works fine. Makes all the right noises etc, and when I take a photo and dl it to my computer it comes out fine. But my LCD screen isn't working, there's just a picture of a crack on it, even though I can't find any cracks on the outside of the camera. Can you help? How much would this cost to fix and how long would it take? Thanks!!!!

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