Problem accessing enterprise manager -password

Hi,
I was running my application successfully on Oracle 9i As Release 2 Enterprise Edition. But suddenly after a restart, i am unable to access the enterprise manager. It doesnot accept the password which i was using till yesterday.
In the command prompt, i tried changing the password using emctl set password abcd
It accepts the password, but even this password doesnot work.
I am neither able to access the website nor able to shutdown EM as it asks for password again!!!!
Kindly help
Thanks
Srinath

when iam startup database
it mount sucessfuly but not open
due to password file curropted....
then iam recreate password file using oradim utility.
then it startup sucessfuly
no error
but the problem is it connect any username and any password when i am connect as sysdba.
why this happend iam not able to understand.....

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