Apple 27” iMac Custom Order - i7 Quad Core and 50 similar items

This was a custom order iMac and was maxed out in specs at the time of purchase. This iMac works but has been giving me some software issues. I brought it to the Apple Store and they were not able to get the OS to work past Catalina. Perhaps it?s a HD issue or some other hardware issue but they?re not able to service it as it?s considered obsolete. It?s being sold As Is. Physically it?s perfect as I?m the only owner and it was used in my office since being purchased. The current iMac is only available in 24? so the 27? is still a desirable screen size.