again, tnx for the video. I have some graphics issues. Well, lets go from the start.
My first try was to boot from USB, reformat HDD to APFS and install HS. After i did that, installation started but on the next boot Clover didn't recognise the APSF partition. My guess was that Clover has to be updated for APFS so i gave up. BTW, i was using the latest version of Clover Bootloader (v.4091)
My 2nd try was to install it on JHFS+ partition. I booted from USB, installation started and after few reboots I was looking at MacOS High Sierra wallpaper. At first i added "nv_disable=1" to disable graphics drivers. After i setup everything, i decided to try to remove "nv_disable=1" and reboot. It booted just fine, no KP's at all but monitor went crazy. Flickering all the time, no wallpaper, just black background. Everything was there tho, the Dock, the Menu bar and HDD's. And resolution was fine, just flickering like crazy.
I don't use Nvidia Web Drivers because not needed for my GTX 550 TI. I've never had any problems with graphics drivers until Sierra. Since sierra came out i've had to use the NVDAStartup.kext from my working el Capitan build. I wouldn't be able to boot to Sierra until i replace that kext. I would use Kext Utility to install it and fix permissions. I would do that after every Sierra update. The problem with High sierra is that method doesn't work anymore. The difference is that i am able to boot to HS without any modification but i get flickering screen. If I use Kext utility to install "NVDAStartup.kext" from working Sierra build, im not able to boot anymore. I figured that Kext Utility is no good at all for HS.
So, my question is anybody can help me with that kext?. I have no idea how to fix it. Is it possible to patch it or something? I can upload both kext, the working one Sierra and the one from HS.
It's a long post but i wanted to explain in details what i have tried so far. Tnx