su does not recognized root password

[Tony Guo]

after I tried a few commands to change to different
versions of shells available (sh, csh, ksh, etc.) with

my fedora core 2 installation, and have a few su-ed
windows open, I suddenly found the su command does not
work any more, neither was my root password
recognized.

Though I was able to get the root password
reestablished, that password is still not recognized
by su command, even with a newly created user account.
 Could you please let  me know if there is a way to
get the problem straighted out.  Thank you very much
for your time to read this message.

Tony Guo


                
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