Originally Posted by nicksfx
What are my options?
You can try emergency booting the new Fedora system. Then, if that works, attempt to re-install its boot loader manually with grub2-install and probably grub2-mkconfig to generate the config file.
If you still have that Fedora 15 system installed (or maybe with that live system, or any other Linux system), you can try emergency booting the new Fedora system with GRUB commands at a GRUB boot menu grub> prompt.
Another idea to manually boot the new Fedora system is a Super Grub 2 Disk
. It's well-known and free, but the GRUB 2 version only boots. It doesn't fix anything like the old legacy version. Booting would be good enough for now though.
You can download and run the free and popular script known as Boot Info Script
and post the output next. It displays a lot information about all of the boot loaders it can find such as where they are located, what they search for and boot, and other stuff. Something in all that may help somebody think of something for you to do.
Anyway, at the very least, return and describe more about things like the partition layout, BIOS vs. EFI, MBR vs. GPT, things like that. Use your live system to get the fdisk output and post that, too.