failed f16 preupgrade, now stuck in grub2 rescue, can't exit

[Heinz Diehl]

On 04.08.2012, jackson byers wrote: 

> I am now stuck in an unresponsive grub2:  ]
>   grub rescue >
[....]

> One difficulty is that my f14 is installed to external usb,
> but my bios won't boot from usb, so the boot files have to
> be put somewhere on my two internal scsi disks,
> which works for me for f14 and  f12, f11 also,
> ( still working, before this present problem.)

I'm not shure if I understand all you write. You should take a look at 
grub2-install, and especially the option "--root-directory=". You
could e.g. copy your bootfiles on one of those disks (or create a
/boot partition there), specify this disk as boot-disk in the BIOS,
and install grub2 into the MBR there.

Note that if you choose a separate /boot partition, your
root-directory will be the toplevel directory related to /boot, and
not /boot itself, otherwise your new installed grub2 will fail to
boot. Precisely, it looks for a directory called /boot in what you
specify as --root-directory, so if you mount /boot on /mnt, it will be
/mnt, and not /mnt/boot or /boot.
 
> Would it help to reinstall my legacy f14 grub to mbr of first internal disk?

Yes, it will.