Error: /bin/sh: Can't access tty; job control turned off

[WangTanky]

My name is Qifeng Wang. You can call me Hank. I am doing a networking project for a primary school and I am using Edubuntu 7.04 for the school network. At the moment, the system works properly and effectively. However, I have a question about backing up system by using command tar. It works find if system is not crashed. But when I tried to use tar to back up system to a new hard disk, it did not work. And I try to restore Grub by using an Edubuntu Live CD and rebooted system. Still not help. 
 
System says: /bin/sh: Can't access tty; job control turned off
 
I was really stuck. Do you have any ideas about this?
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