No startup disk visible on desktop
My iMac is running on Sonoma. When I installed the most recent version, my Plural Eyes app would not work anymore. I (foolishly) tried to downgrade the OS, and finally got into the version that was originally om my Mac. I could start up the computer but there was a message that a disk (must have been the startup disk) could not be used because it contained something that could not breed by this OS.
Finally I managed to get Sonoma back, but there was no startup disk anymore on the desktop. To fix this, I tried disk utility as was advised. Had disk utility check all disks with the name Macintosh HD (which was the name of my startup disk). I'm afraid I messed up with the user. It seems I divided my startup disk in some way. Can anybody please help? Thanks
iMac 27″