Trying to wipe an iMac for sale.
iMac doesn't respond to Cmdr-R recovery start up (needed to wipe data via Disk Utility), but goes directly to the user selection screen, with no bong at all. I recently updated the OS to 12.6.5 (Monterey), as my iMac was made in 2015. I assume that this problem is some glitch owing to not smoothly running the new OS, but I am not completely sure of the procedure to reinstall the OS.
iMac 27″, macOS 12.6