You'll need to reset the factory defaults.
Download the User Guide (PDF) from here:
http://www.lexmark.com/publications/pdfs/2007/4800/en.html
(I'm assuming you have the something in the 4800 series of printers, though you posted your question in the 5400 series section)
Go to page 56&57 and follow the directions there.
If you have the 5400 series, the link is here:
http://www.lexmark.com/publications/pdfs/2007/5400/en.html
See page 123.
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Pleaselet us know the exact printer model number.
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