That wont help.  See the thread "Updates are failing".  There is a problem with the i586 updates.

paolo

On Sun, Jul 12, 2009 at 4:34 PM, Geoffrey Leach <geoff@hughes.net> wrote:
On 07/12/2009 04:12:22 PM, Mike Adolf wrote:
> I just got a panel icon alert that there were several updates for
> Fedora
> 11. But after running the updates not all were able to download. Here
> are a few of the not-too-informative errors. Can this be corrected.
>
> -----------------------------------------------------------------
> grubby-6.0.87-1.fc11.i586: failure: grubby-6.0.87-1.fc11.i586.rpm
> from
> updates: (256, 'No more mirrors to try.')
> farsight2-0.0.12-1.fc11.i586: failure:
> farsight2-0.0.12-1.fc11.i586.rpm
> from updates: (256, 'No more mirrors to try.')
> 12:dhclient-4.1.0-22.fc11.i586: failure:
> dhclient-4.1.0-22.fc11.i586.rpm
> from updates: (256, 'No more mirrors to try.')
> alsa-plugins-pulseaudio-1.0.20-2.fc11.i586: failure:
> alsa-plugins-pulseaudio-1.0.20-2.fc11.i586.rpm from updates: (256,
> 'No
> more mirrors to try.')

Try 'yum update' as root