Finally, finally, Finally!!!! I figured how to get this hackintosh working after upgrading to Catalina. If you are having a black screen, try the following; Use HDMI cable, and go to options in BIOS - disable the integrated graphics and enable the secure boot. MANY THANKS to @scottkendall for the help with config.plst. His config.plst was not the problem - the issue was in BIOS. Be sure to check your BIOS settings.
@scottkendall Thank you again for your help earlier in December 2019. I have been using the USB stick that I uploaded your Config file (after updating it with my sn etc). Since I have been working from home now, I want to see if it's possible that i could boot up the system directly without the USB stick. Right now, I can't mount the EFI partition from the USB stick. Any suggestion as to how I can do that?