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Officejet Pro 6978. Just installed new black cartridge. Why isn't it printing black?

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doconnell13

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I guess I should ask if you used an HP replacement cartridge or another brand? The printer may not recognize a 3rd party replacement cartridge. Next, assuming you are using an HP cartridge, is it new or a refill? A refilled cartridge may have dried ink blocking the ejection ports on the cartridge.
So I would start with a reset of the printer. remove the ink cartridges. Disconnect the cables, and press the power button for 30 seconds. Then reconnect the cables, turn the unit on and reinsert the ink cartridges. Do a test print. If the black still doesn't work try cleaning the print head.
Click the setup icon and go to Printer Maintenance, click Clean Print Head. You should hear the machine doing this. Print a test page and see if this fixes the issue. If it doesn't or only partially fixes the problem wait 10 minutes and clean the print head again. Hopefully, this will at least improve the issue. If the print quality still doesn't look right wait 10 minutes and repeat the cleaning again.
Hopefully your issue is fixed. If it still isn't printing, could it be your paper? Is it the same paper you were using before? Some kinds of paper do not absorb ink very well.
Hope this helps.

Posted on Sep 22, 2020

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