Kuo-Rong Lei wrote:
> Hi, all:
> 
> 
> --------------------------------------------------------------------------------
> 
> Is there anyone know how to solve this problem??
>  Thanks.

Boot the system using a live CD, such as the SL live CD, a Knoppix CD.
Or in our case I would PXE boot the system in a RAMDISK mode (ie. root
filesystem is a RAMDISK).

Then:
e2label /dev/hda1
to check that hda1 has been labelled properly as '/'
Then
e2label /dev/hda1 /

That might not cure the problem - you might have to
mount /dev/hda1 /mnt/hda1
chroot /mnt/hda1
grub-install

ie. re-install grub if you think it has not installed properly.
From your error message, I suspect grub is OK and that the filesystem is
 not labelled properly as '/'

An alternative way is to use the command line propmpt in Grub and give
different options to the kernel,
 root= <my root partition >

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