LinuxQuestions.org - /bin/bash: permission denied(after / partition moved)

I install Fedora 9 in a partition of 6.3G. Here is the result of 'fdisk -l'

Code:

Disk /dev/sda: 40.0 GB, 40007761920 bytes

255 heads, 63 sectors/track, 4864 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

Disk identifier: 0x3af63af5



  Device Boot      Start        End      Blocks  Id  System

/dev/sda1  *          1        892    7164958+  b  W95 FAT32

/dev/sda2            893        2167    10241437+  c  W95 FAT32 (LBA)

/dev/sda3            2168        4079    15358140    c  W95 FAT32 (LBA)

/dev/sda4            4080        4864    6305512+  5  Extended

/dev/sda5            4080        4092      104391  83  Linux

/dev/sda6            4093        4222    1044193+  82  Linux swap / Solaris

/dev/sda7            4223        4864    5156833+  83  Linux

Because the '/' is growing bigger and bigger, I decide to get more space for my fedora. But the free space(/dev/sda3) is not adjacent to '/'(/dev/sda7), so i can't merge these two partitions using fdisk.
So I decide to move the '/' to /dev/sda3.
here is my steps:
(0) liveCD...
(1) mkfs.ext3 /dev/sda3
(2) mount -t ext3 /dev/sda3 /mnt/sda3/;mount -t ext3 /dev/sda7 /mnt/sda7/
(3) cp -a /mnt/sda7/* /mnt/sda3/
(4) modify /mnt/sda3/etc/fstab to change the location of ‘/’
(5) modify /boot/grub/grub.conf, add something as follows:

Code:

title NewFedora (2.6.25.3-18.fc9.i686)

        root (hd0,4)

        kernel /vmlinuz-2.6.25.3-18.fc9.i686 ro root=/dev/sda3 rhgb quiet

        initrd /initrd-2.6.25.3-18.fc9.i686.img

title Fedora (2.6.25.3-18.fc9.i686)

        root (hd0,4)

        kernel /vmlinuz-2.6.25.3-18.fc9.i686 ro root=/dev/sda7 rhgb quiet

        initrd /initrd-2.6.25.3-18.fc9.i686.img

The first title is all about of my 'new' system location. And I can login the original one.
(6) rebbot
I choose the NewFedora(/dev/sda3) and I can see the Fedora9 GUI login interface, I try login as root or other user, all failed. I switch to VT (using Ctrl+Alt+F1) to login in, failed. I try the ssh-client from other computer, got this:

Code:

last login.....

/bin/bash: permission denied.

I google the "/bin/bash: permission denied" and discover this land. I have read all title with '/bin/bash: permission denied', and I check the file system access mode.

here is the /dev/sda3:

Code:

[...]$ ll -a /mnt/sda3/

Total 96

drwxr-xr-x  19 root root 4096 06-15 22:28 .

drwxr-xr-x  5 root root 4096 05-17 21:57 ..

drwxr-xr-x  2 root root 4096 05-28 10:12 bin

drwxr-xr-x  2 root root 4096 05-17 18:15 boot

drwxr-xr-x  2 root root 4096 05-17 18:18 dev

drwxr-xr-x 124 root root 8192 06-15 22:28 etc

drwxr-xr-x  3 root root 4096 06-15 13:41 home

drwxr-xr-x  15 root root 8192 05-26 09:34 lib

drwx------  2 root root 4096 05-17 18:15 lost+found

drwxr-xr-x  2 root root 4096 06-15 22:25 media

drwxr-xr-x  5 root root 4096 05-17 21:57 mnt

drwxr-xr-x  2 root root 4096 05-17 18:15 proc

drwxr-x---  36 root root 4096 06-15 16:16 root

drwxr-xr-x  2 root root 8192 05-28 10:12 sbin

drwxr-xr-x  2 root root 4096 05-17 18:18 selinux

drwxr-xr-x  2 root root 4096 05-17 18:15 sys

drwxrwxrwt 129 root root 4096 06-15 22:27 tmp

drwxr-xr-x  13 root root 4096 06-01 14:38 usr

drwxr-xr-x  23 root root 4096 05-17 16:01 var

here is my 'new' system's fstab:

Code:

UUID=bea271e0-5490-4701-9039-3e2e432b87f5 /                      ext3    defaults        1 1

UUID=ff4b53a9-a43e-4e0f-8159-d39ad8b0a51d /boot                  ext3    defaults        1 2

tmpfs                  /dev/shm                tmpfs  defaults        0 0

devpts                  /dev/pts                devpts  gid=5,mode=620  0 0

sysfs                  /sys                    sysfs  defaults        0 0

proc                    /proc                  proc    defaults        0 0

UUID=eff25086-826d-4d3e-9694-27cc0cc497f6 swap                    swap    defaults        0 0

I can't login in this 'new' system, so I can't use strace to debug this problem.
I hate reinstall system. I need your help. Any suggestion will be appreciate. :)