Kinda bricked my LG G2 - G2 Q&A, Help & Troubleshooting

Good evening
I (at least) tried to install a custom ROM on my LG G2 D802 today.
I rooted the device.
Also installed the TWRP Recovery.
After that, i tried to install CyanogenMod.
Now, if I try to start my phone, the LG Logo flashes and goes away after about 1 sec. The screen stays black, but its on.
If I do a hard reset, i can go into TWRP. I tried two different ROMs.
Is this problem known and is there a fix for it?
Best regards

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