Subj: Cannot install FreeBSD

[Johneh]

Followed steps in FreeBSD instal manual Ch 2.
OS X El Capitan Ver 10.11.6 , iMac (24”, mid 2007), Processor 2.8 GHz Core2 Duo,
Downloaded FreeBSD-13.0-RELEASE-amd64-dvd1.iso. Burned to dvd.
inserted dvd, and depressed “Alt” key at boot, Result > two HD icons, macintosh HD (default arrow), and
Recovery 10.11.6. Option for install not present.
I want to install FreBSD and over write the current iMac OS which is Darwin.

 

[Cath O'Deray]

Ignoring the visuals of Apple's startup manager, try booting with traditional use of the C key.

In the Wayback Machine:

Startup key combinations for Intel-based Macs - Apple Support
<https://web.archive.org/web/20141123171410/http://support.apple.com/en-gb/HT201255>