One of the nice things about Grub2 is it has a decent command line (with
autocompletion!), so you can easily play around and try booting Fedora from
there. Some handy things you can do:

ls (hdTAB   will list your drives, you should see (hd0) and (hd1)
ls (hd1,TAB   will list the partitions on drive 1, including the filesystem
type. Hopefully it will indicate that (hd1,2) and (hd1,4) are linux
partitions. (PS: What fs type are they?)

ls (hd1,2)/   will list the files at the root of sdb2
ls (hd1,2)/vmliTAB   should autocomplete to your Fedora kernel's path


So then you can try booting with something like this:

set root=(hd1,2)
linux /vmlinuz root=/dev/sdb4
initrd /initrd.img
boot


There are a couple of potential gotchas: If Fedora uses different names for
vmlinuz and initrd.img, you'll need to use those of course—tab completion is
your friend! your bios hates you then your disks will reorder randomly, the
solution for which is using UUIDs instead of sdXY and (hdX,Y).

Even if this doesn't work, it will hopefully at least give you a useful
error message. If it does work, then you can edit /etc/grub.d/40_custom to
include a menuentry for Fedora, and then Grub2 will be booting both distros.

Dave
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