After patching only black screen

Hello I made a legacypatcher and when I turn on my mid 2010 iMac i hear chime and I have only black screen. I tried switch ssd to original hdd and same situation, I’m 100% sure that screen is not broken and also gpu is working as well. I don’t know what to do, I can buy today a mini DisplayPort to hdmi and try external monitor, but is it worth it? Or is there another fix for that ?

submitted by /u/Ok-Patient7572
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