Root password

["Jonathan Erickson" <jon.erickson@neicoltech.org>]

Yesterday when I tried to log in as root on my linux box and it rejected my password.
 I also tried to log in using a normal user account and that didn't work either.
 I tried both accounts mulitiple times.  Strange thing is, I know that both
passwords were correct.  The box isn't networked so I don't think I was hacked.
 I have tried many ways to get in but to no avail.  Single user mode requires
the root password.  I've also downloaded mu-linux which is a mini-distro of
linux that fits on a 1.44Mb floppy (which is very cool by the way) and tried
to mount my root partition which didn't work either.  I used the following command
with no luck:

mount -t ext2 /dev/hda2 /mnt

Error message said that it couldn't find a valid ext2 partition on that device
and something about a bad superblock.  I tried to mount all my partitions this
way, thinking that maybe it was on a different device but that didn't work either.
 I'm kinda stuck right now, any suggestions would be appreciated