Boot from DVD (bios setting)

I’ve been trying to install Fedora from DVD but couldn’t get the machine to read the DVD when it booted. I kept thinking it was a BIOS setting I had wrong (I could only choose ‘CD’ as a boot option). Eventually, I tried a bootable CD and that wouldn’t work either. The problem all along was that I had the DVD set as ‘cable select’ (and it selected itself as slave which may not have helped). When I changed the jumper to ‘Master’ I could boot from CD’s and DVD’s. I never found the answer when googling so I post this here in case it helps someone else.