A 5M is not a spring chicken, and may just need to have the entire paper path cleaned. Go to www.hp.com and go to support.  HP may have an article on exactly this problem.  Check it out before you do anything.
>
>We are having a streaking problem down the middle of the paper about an inch
>wide with our LaserJet 5M printer.  I have tried changing cartridges but
>that doesn't do any good.   We are currently using remanufactured toner
>cartridges and I have not tried buying a brand new cartridge to see if it is
>that.  Before I went to the expense of a new cartridge or getting the
>machine serviced, I was wondering if any one had any thoughts on whether it
>might be the printer or the cartridge.  The problem seems to get worse after
>printing bar codes for our delivery drivers and then gets better after
>printing regular things but it never goes away completely.
>
>

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