Hi Dann,
I wonder if this is caused by the same thing as #508820. The fact that
> you couldn't reboot suggests that it might. Can you collect the same
> information I requested in that report?
> http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=508820#12
>
> Can you try booting another non-2.6.26 kernel, and then reinstalling
> 2.6.26-11? I wonder if that will fix your problem.
>
As suggested, I've successfully reinstalled 2.6.26-11 by booting from a
2.6.24 kernel and this fixed the problem.
Many thanks for your support.
Émeric