Hello mates!
So i have an iMac mid 2010 21.5', and today i tried to update the gpu. I had ATi Radeon HD5670, and installed AMD Firepro M5100 (AMD Radeon R9 M370x)-RED PCB
I added the boot-args from this post https://forums.macrumors.com/threads/2011-imac-graphics-card-upgrade.1596614/page-662?post=30485318#post-30485318 .
No boot screen, which is normally from what i read, but i got black screen no matter what. Finally i got this... https://ibb.co/Xz8RPWV
After that, i tried to reinstall the old card, so i can patch the system with opencore, but now imac wont post at all, only 1 diag LED.
The old card may be broken, no problem, but what can i do to make the new card work?
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