P920 does not start with exchange digitizer - LG Optimus 3D

Hi,
the front screen of my p920 is cracked, but it still works perfect. Now i have replaced the cracked screen with a new one. The problem is, once the new display is connected, the phone does not boot up. It starts and shows the silvern LG logo, but then the screen stays black. The Custom Rom "GPCR ICS V2.1 by P-VLAD" is installed. When I connect the old (cracked) screen, everything works fine. Even if neither of these is connected the p920 boots perfect, without a staying black screen. But as soon as I connect the new touch screen, it does not work. Why? Defective touch screen or problems with the custom rom perhaps?
Regards,
Nils
Edit:
Also the new one doesnt look exactly the same as the original touch screen. Here is a picture: oi41.tinypic.com/30ij1v9.jpg

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Should i take it apart to reseat it?
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New Flex cable?
New Screen?
Pray?
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