Recently, i tried to upgrade my 2017 iMac through OCLP, after selecting the appropriate model in the settings I installed Sequoia 15.2 installer to internal drive, rebooted and chose „Install Sequoia” in EFI. After that only a black screen appeared, now i can’t boot into the system anymore, i tried rebooting it and going into EFI but there is not even an Apple logo while booting, only a sound. It seems that there is also a problem with connecting to a wireless Apple keyboard, so I tried a Windows one, but it didn’t light up. It’s weird because i connected a usb light to the same port and it worked. How can i fix it?
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