Dell Optiplex 7470 Pink or Black screen

Hello sir,
I have Dell Optiplex 7470 All-In-One, with 9th gen Coffee lake refresh CPU. I have followed dortania's guide but my screen becomes black. Then I saw that adding boot arg -igfxmod=pikera will solve it but no chance. Then I tried hackintool, it resloves the problem of graphic accellerattion but screen is Pink. I have also visited these sites

https://dortania.github.io/OpenCore-Post-Install/gpu-patching/intel-patching/connector.html

https://www.youtube.com/watch?v=zWb9mcaXeEU

https://www.youtube.com/watch?v=yxQVTtfJw2Y&t=609s

https://dortania.github.io/OpenCore-Post-Install/gpu-patching/intel-patching/connector.html

https://dortania.github.io/OpenCore-Post-Install/gpu-patching/intel-patching/connector.html

https://www.reddit.com/r/hackintosh/comments/osjyqv/pink_magenta_screen_solved/

the last link needs more clearification to fully understand

but still no results. Sometimes it goes black screen and sometimes Pink. Please help me resolve this issue. Thanks

submitted by /u/Calm_Worry_2335
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