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black ink not working but all other colors print

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HP OfficeJet Pro 6978

Note from moderators: this message was originally posted in another topic, but it was moved to a new one to give more visibility for volunteers that help customers in the Community.  


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Same Issue with my HP OfficeJet Pro 6978. I've tried 3 new HP black 902 cartridges and installed new HP color cartridges.  Nothing is printed in black.

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@Billinnj, Welcome to the HP Support Community! I’m here to help.


I understand the printer is not printing in black. Make sure you have tried the steps mentioned in this document - Black or Color Ink Not Printing, Other Print Quality Issues

I see that you have used 3 different black ink cartridges and the issue persists. This means that the printhead has gone bad.


Please reach out to the HP Technical Support team in your region regarding the service/replacement options for your printer. 

You may create a case on the website to obtain a case number if required. Kindly watch this video to know how.


If the printer is out of warranty, I suggest you upgrade the printer. You may visit Hp Store to check the available printers.


Keep me posted for any other assistance.


lease 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 bottom right to say “Thanks” for helping!

Have a great day! 

I am an HP Employee

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