Forgot sysadmin password, how to reset?

Hi
We have oracle EBS R12.0.6 instance running.Somebody who has system administrator responisiblity changed, sysadmin password. When i query help>record history does shows 'system logon=unknown'. If auditing is not enabled, how do i know who changed it? Besides, why system says 'system logon=unknown'? How can i reset to new password?

Hi;
Did you check my blog?(My previous post) I already cover this topic wiht step by step
If still you have not convinced help please check:
Re: how to change sysadmin password
Re: apps password
Regard
Helios

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