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HP OfficeJet Pro 6978 not printing

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HP OfficeJet Pro 6978
macOS 10.13 High Sierra

My ink ran out and I replaced the ink (both the color and blank and white) with new HP cartiridges.  The printer now prints blank pages. I attempted to print the alignment page, but the only thing that prints is the pink "Important!" and important sign. I attempted to restart the printer.  I attempted to take out and put in the cartridges.  I can't figure out what to do... Help! 

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Welcome to the H support community.


Check for issues with the ink cartridges

  1. Use a pin or paper clip to remove any debris or excess adhesive from the vent on top of the cartridge.

    Cleaning the vent on the cartridge

  2. Reinsert the cartridge into its color-coded slot, and then press down on it until it snaps into place.

  3. Repeat these steps to inspect and clean the vent on the other cartridges.

    If the issue persists with a specific color, replace that cartridge.

    If you have a defective HP cartridge, it might be under warranty. Go to About Original HP Cartridges for page yield and HP limited warranty information.

Run the automated printhead or ink cartridge cleaning tool

  1. Load plain white paper in the tray.

  2. Run the cleaning tool.

    • Printers with a touchscreen or menus: On the printer, open the Settings or Setup menu, touch Tools or Printer Maintenance, and then touch Clean Printhead or Clean Cartridges.

    • Printers without a touchscreen or menus: Go to or your app store to install the HP Smart app. Click the picture of your printer on the home screen to open printer management options that include the cleaning tool.

  3. If the page that prints has defects, the printhead might be badly clogged. Run up to two more cleaning cycles.

You can refer this HP document for more assistance:- Click here


Let me know how it goes. 

To thank me for my efforts to help you, please mark my post as an accepted solution so that it benefits several others.


I am an HP Employee

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