Do I need an HDMI port on my 2011 Imac to use a 2023 Apple mac mini?
Do I need a HDMI port on my 2011 Imac to upgrade to a 2023 Apple Mac Mini?
Question marked as
You will need to purchase a proper monitor.
You cannot use the iMac as a monitor for the new Mac mini.
That setup is not supported by Apple. The iMac cannot be used as a monitor for any of the newest Macs and Target Display mode is no longer a feature of macOS, having been deprecated several years ago.
Please see: Use your iMac as a display with target display mode - Apple Support
Per the link above:
• Your target iMac (monitor) must be using macOS High Sierra 10.13.6 or earlier.
• In all cases the source Mac that you're connecting FROM must have been introduced in 2019 or earlier and have macOS 10.15 Catalina or earlier installed.
However, you might consider a third-party solution, for example: Luna Display or Duet Display.