M7 doens't boot with replacement display - One (M7) Q&A, Help & Troubleshooting

Hi everyone,
I have a weird issue with my M7.
It fell down and now the glas is cracked, but everthing is still working fine. Now I wanted to replace the screen and I bought a new display+touchscreen.
The weird thing now happens: when I connect the new display the phoen won't boot (just using the flexcable for the display is enough ... touch doesn't matter). It gets stuck directly after the bootlogo.
I can access the bootloader, but not the recovery or the system. When I reconnect the old display everything is working fine.
At first I thought that the new display might be defective and I sent it back. Now I got a new one from another seller and I have the same issue again.
I tried it with newest twrp and cwm recovery + CM11 and the stock firmware via Guru Reset M7 2.24.161.1
Any ideas?
Edit:
Just recognized that the device seems to boot, but the screen is just black (background light on) ... well at least I was able to reboot the device via adb (stock 4.2.2)

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