iMac 27 mid 2011 - need help please - black screen

Been reading a lot but can’t figure out my problem. Successfully upgraded to Ventura as per screen shot. I was then prompted to instal the post-install root patch and it went south from there after that reboot. I get a black screen, or very dark grey (with Apple chime). I’m using a generic keyboard and that’s the only thing plugged in. Tried all usb ports also. I’ve tried every boot key entries combinations to boot in recovery mode, internet recovery mode, safe mode, clean up NVRAM, etc. Keyboards work on another Mac. I don’t care about data, just want to reset everything. There were no issues before and running Catalina. Any suggestion or help is appreciated. Thank you.