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Big Problem: OC only starts into black screen, even from different boot disks

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Hi, I have a big problem:


I made an error configuring OpenCore OpenCanopy on one internal disk. Now it only starts into a black screen, no icons, no text picker.


So I thought, I just start the machine from another disk with another unmodified OC-Installation, but I was wrong: Also here it starts into a black screen.


So last try was to start from an usb stick with using the text picker. But also here: Open Core only starts into a black screen.


I am confused, why OC is misbehaving even after starting from an unmodified boot disk? How to fix? Any idea?


Thanks for any help on this one...

Edited by Professor
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