Android Nexus S I9023 Black Screen

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http://androidforums.com – I dropped my phone, the top right corner is cracked. When i try to turn it on, it turns on and the screen lights up but the screen stays black. I am able to adjust the volume, unlock my phone and access the normal functions but the screen stays black and the corner where is is cracked lights up white. Is there anything I can do to fix it or do I have to send it to repairs? And if so, approximately how much would it cost? (General)