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Hello and thanks for using JustAnswer.com I am Serge and I will try my best to assist you.
It seems that you have tried everything that is suggested by lexmark support. http://support.lexmark.com/index?modifiedDate=05%2F28%2F12&page=content&id=HO3824&locale=en&userlocale=EN_US
Since none of suggestions helped, Lexmark suggests to contact their support center: http://www.lexmark.com/en_US/support-downloads/find-service-provider.shtml
hope this helps
or call Lexmark at 1-***-***-****