HP Officejet pro 8500a prints endless stream of un-ordered blank sheets with one character on them

My HP Officejet Pro 8500a worked fine until about 2 weeks ago (it is about 3 months old).  It began printing endlessly (during a period that no documents are being sent to the printer - I want to be clear this is not in regard to ORDERED documents from any of the computers).  It prints out a sheet of paper with a D in the first character spot in the left top corner, then spits out the paper.  It keeps going until it runs out of paper.  The only way to stop it is to 1) turn it off  2)keep pressing the "cancel print" button (every 5-10 seconds) or 3) take out the paper.  This of course is a hassle because while actually trying to print a document (which does come out fine), we have to load fresh paper and lose several pieces while the printer continues it's freak out before printing our ORDERED document.  
Spent almost 2 1/2 hours on tech support yesterday - it took 2 hours to MAKE IT CLEAR that the printer was PRINTING ON IT'S OWN.  The tech kept trying to "fix" the documents I was printing (which are FINE, as I said).  Finally, I was told that a higher level tech would have to call me back - but looking through forums, it appears that's an empty promise and no point in waiting for assitance.
Any suggestions?
This question was solved.
View Solution.

Let's start by resetting the printer.  Turn it off, hold the # and 6 keys while and a bit after turning it back on.
What router brand/model are you using?  What operating system on your computer?
Say thanks by clicking "Kudos" "thumbs up" in the post that helped you.
I am employed by HP

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    If your problem is solved please click the "Accept as Solution" button ------------V
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    This question was solved.
    View Solution.

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    Please click “Accept as Solution " if you feel my post solved your issue, it will help others find the solution.
    Click the “Kudos, Thumbs Up" on the right to say “Thanks" for helping!
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    I work on behalf of HP
    "Remember, I'm pulling for you, we're all in this together!" - Red Green.

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