Maybe the password had an expiration date or the user account is locked for some reason. As root, you can go in Yast --> Security and Users --> User Management, then select the user and click on edit. Look around if there is something strange: in particular look at the "Disable User Login" box and be sure it is unchecked.
Otherwise, as root try to reset password for the user, as sophkos already suggested.
Quote:
Originally Posted by hellknight87
there is important data lying in my home partition which i want to access. I don't want to reformat and install Linux again.
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You will not lose any data, as long as you have access as root. But always consider to do a backup of your valuable data, somewhere (on an external device).
