Kernel Panic! could not mount root fs. Please help me out.
 

Hello everybody.

I have this trouble recently.
In the past I have encouter it twice.
The first is when I tried to recompile kernel. The second time is when my linux install disk refuse to boot.
Both twice, I reinstalled my linux.
And now, I see that line again.
I don't remember what did I do exactly.
I have both mandriva and fedora core 4 install on one PC.
I use the grub version come with mandriva.
I confiured it to boot fedora core 4.
Recently I open the mandrake control center software and check some options which allow me to boot with graphical interface.
When I restart, what have this silly software done?.
I see a black and white screen instead of my all slpash image.
Both two distro refuse to boot.
I remove a strange argument in the mandriva boot command and it boot.
But Fedora core 4 doesn't. It give me a deadly messages.
"Kernel panic! Could not mount root files system at (104,3)."
I don't know what was that line mean.

The fc4 boot command in grub.conf file was:
root (hd0,0)
kernel /boot/vmlinuz-...(the version)..FC4 ro root=/dev/hda1 rhgb quiet.
initrd /boot/initrd-...(the version)...FC4.img

Please, help me.

I have reinstalled FC4. Again, reinstall fix my problem.
I think the cause of the prblem was an kernel change or initrd change. Do you think so.