OK, got it to boot with sone instructions I found on the web:

http://techgage.com/news/repairing_a_broken_grub_2_boot-loader_on_ubuntu/

Just had to change somethings so that they looked like in my system
(devices, path to vmlinuz, etc.)

Now, how do I verify that my grub.cfg is good, and it's installed
corrctlly so that I don't have to enter all those options by hand the
next time I have to boot?

BTW, grub2-install /dev/sda works great, but grub2-probe /dev/sda
gives this error:

grub2-probe: error: cannot stat 'devtmpfs'

2012/5/8 Martín Marqués <martin.marques@gmail.com>:
> Today I performed a yum upgrade from F15 to F16 (as I did some time
> ago with my main computer).
>
> The thing is that I did something differently (maybe not installing
> grub2 on F15 before the upgrade) and after yum finished upgrading, I
> did a grub2-install. Bad for me, now grub doesn't show a menu , but a
> grub prompt.
>
> Tried booting a live image (through a USB stick), and thought I had it
> fixed: created a grub2.cfg file in /boot/grub2/ (from the root of the
> hard drive, not the USB) and ran grub2-install
> --boot-directory=/media/boot/grub2 /dev/sda. Didn't give any errors,
> but didn't work. Still can't get grub2 to boot.
>
> Any help will be appreciated
>
> --
> Martín Marqués
> select 'martin.marques' || '@' || 'gmail.com'
> DBA, Programador, Administrador



--
Martín Marqués
select 'martin.marques' || '@' || 'gmail.com'
DBA, Programador, Administrador
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On Tue, 2012-05-08 at 19:40 -0300, Martín Marqués wrote:
> OK, got it to boot with sone instructions I found on the web:
>
> http://techgage.com/news/repairing_a_broken_grub_2_boot-loader_on_ubuntu/
>
> Just had to change somethings so that they looked like in my system
> (devices, path to vmlinuz, etc.)
>
> Now, how do I verify that my grub.cfg is good, and it's installed
> corrctlly so that I don't have to enter all those options by hand the
> next time I have to boot?
>
> BTW, grub2-install /dev/sda works great, but grub2-probe /dev/sda
> gives this error:
>
> grub2-probe: error: cannot stat 'devtmpfs'
>
I get the same error when I run the above command and my grub2 is
working normally.
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