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I'm using redhat el 5.4. I was trying to change the root password under single user mode. I got no error when I ran passwd.

However, when I boot from normal mode, my new password is still not accepted.

Appreciate your help

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Is there any chance you are mounting a new /etc on a different partition once booted? – Paul Nov 22 '11 at 0:00
It finally worked after several tries. I don't know what happened though. Thanks for looking into it anyway – Phil Nov 22 '11 at 3:01
No problem, please add and accept your comment as an answer so the question is removed from unanswered. – Paul Nov 22 '11 at 3:02
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It finally worked after several tries. I don't know what happened though. Thanks for looking into it

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Often the reason you can't change the password is because the boot volume is mounted as read-only. Try mounting your root filesystem with mount -w before trying to change the password.

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