We might all imagine how many reams of paper HP must go through testing their printers before they hit the market, and how they must pass certain tests and get tweaked along the way. If you envision rooms full of printers and the smell of heated toner hitting the paper, you are not alone. At the Boise Idaho HP campus, there is so much more than I could ever have imagined. As the COO of DaniWeb, I was invited out to tour the campus and get a ‘behind-the-scenes’ look at HP’s printer testing campus in order to answer the question: …

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I have a Hp Laserjet 3030 all-in-one and it just started printing almost solid grey over the whole page. I tried changing resolutions and other settings, ran the printer's own cleaning cycle a couple times, nothing changed. Even on draft mode it still covers the page. It's not perfectly solid, more like horizontal banding but it covers about 85% of the page or more in grey. Since the HP 12a drums have no functions for physical cleaning, I replaced the drum entirely, put in a brand new HP 12a. Made a test print, and it has the SAME problem but …

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The End.