I have an older PC (32-bit, 3.4 GHz, single-core) that doesn't recognize an Ubuntu Server 14.04 Live CD as valid boot media.
- The machine boots successfully from HDD (currently, Win XP is residing)
- The machine boots successfully from DVD drive, using Minux 3 CD
- The machine will NOT boot from Ubuntu 9 Desktop, Ubuntu 12.04 Desktop, or Ubuntu 14.04 Server Live CD's
Also, regarding the 3 Ubuntu discs, I've used the Live CD's for 9 and 12.04 on other machines, so they are known good. The 14.04 disc is new and I've never used it before, but appears good when I look at its contents on a different machine.
It just occurred to me to verify the 14.04 disc by using it to boot on another machine, so I'll do that tonight and update.
When I try to boot from those discs, the BIOS POST runs and then I get an error that there's no valid boot media, or it boots to WinXP (depending on whether I enable/disable the HDD in the boot sequence).
Why won't my machine boot the Ubuntu Live CD's?