A retro iMac G4 is now an external monitor thanks to DockLite G4. The innovative device allows users to turn their old iMacs into modern displays with HDMI connectivity, USB ports, and more. With a 30-minute installation process, owners can breathe new life into their classic computers.

Source: https://www.theverge.com/2024/10/19/24274206/imac-g4-docklite-g4-external-monitor-display-hdmi-conversion-apple-silicon-mac