Root account desactivated

["MARTIN M. Bénoni" <benoni_martin () hotmail com>]

Hi community!

I have a really stupid trouble: on a Redhat 9.0, the line matching the root 
account in the file /etc/passwd has been changed from ".../bin/bash" to 
".../sbin/nologin". We have the root password, but when performing a "su" 
command, the system replies that the account is not currently available.

So the question is: how from an user's account and knowing the root's 
password but having the root account disabled can we reactivate this root's 
account?

Any suggestion would be appreciated, I do not want to reinstall the box :(

Thanks a lot in advance!

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