I just bought a new notebook without os and was trying to get linux going. So I burned the linux ubuntu iso from https://www.ubuntu.com/download/desktop on a dvd and set up my bios menu to boot from dvd. However when I start the pc, he just refuses to boot from my dvd. So I tried to do the same thing with a win on a different dvd and it worked just fine. I tried to figure out what I am doing wrong for several hours now. Its a lenovo notebook with freeos installed. bios settings are booted from legacy and ofc dvd.
Not sure, my answer could be too helpfull: I solved something similar with Lenovo ThinkPad, but there was MS-windows8 preinstalled. It was necessary to toggle many settings in BIOS. Namely: the BIOS reloaded the factory default; the option "quick boot" blocked to boot anything else than WindowsBootManager; usualy there are some dirty trick under the "Secure boot" BIOS menu; if possible use "legacy" instead of UEFI. I do not have CD/DVD drive, hence I booted from USB "hybrid" - I hope, the Ubuntu Live CD ISO image can be also used on USB-flash. You can test also some other Live distributioins - Kali, CAINE, ArchLinux, Fedora, Debian etc. Cross fingers or pray.