Phone fell, no cracked screen, but now there is no picture..please help

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http://forums.androidcentral.com – Hi all, Happy New Year! My girlfriend's phone fell, there is no physical sign that it fell but there is no picture on the screen. I opened up the phone and plugged in the screen from my phone, the picture is there and the phone works fine. I didnt open the phone completely just the back and plugged in my screen by lining up my phone side by side. I'm hoping i dont have to replace anything and it's just something unplugged on the other side because i see that the price is pretty high for the digitizer and glass. If anyone can help it would be greatly appreciated. Thanks (HowTos)