Which OS should I install on iMac Mid 2011 27 inch (32GB ram / 256GB SSD)? Black screen error / Stuck on progress bar

Hi everyone,

I’ve been trying for more than 2 days now to install a macOS on my 27 inch mid 2011 iMac and it’s still unsuccessful.. I tried Sequoia 15.7.1, I managed to login, but once I installed the root patches and reboot, I had the black screen issue. Sometimes I get stuck on the progress bar.

I did a NPRAM reset, SMC reset, Safe boot, nothing worked. I also tried with Monterey and Big Sur and I still have the same issue. I was wondering if someone had the same problems and managed to successfully install an OS.

** I have 32gb of RAM (4x8gb) and 256gb SSD (I don’t know if the ram could be an issue?) **

A step-by-step guide or any reliable resource would be really helpful. Thanks in advance for your help!