I have an old white iMac Core Duo and its running MacOS Lion. It wont allow me to boot of the USB or Disc that have the Elementary OS 5 Flashed/Burned on them. I have tried both the USB and DISC method and once burned to USB or DISC is not recognisable.
I have used the Etcher software to flash the USB but its then unreadable. I have right clicked the ISO and selected Burn to Disc and again once done its not recognisable by my iMac Pro or old White iMac Core Duo.
No idea what I am doing wrong?? Help!! Please.