Need help, won't boot just black screen HELP?!

I urgently need help solving this as i need access to a file on my mac. Earlier today I was using my 2011 open core imac that runs sonoma and the wifi was being buggy so I decided to reinstall root patches but unfortunately my electricity flickered during the reboot for installing root patches and when the power came back I tried turning it on and now it won't boot into macos. It plays the startup chime and when I go to start sonoma it shows the apple logo screen with a loading bar then get stuck about halfway through for a while then eventually changes to a pure black screen where i can't do anything. I've rebooted over 100 times to no avail as well as resetting ram and everything else ive found on google. Unfortunately I dont have any time machine backups. Can someone please help me boot into mac os so I can retry root patches or at least help me figure whats going on????