My Officejet Pro 6978 won't print blue. The black, pink, and yellow all work fine. ?

[Jimbotron1]

I can't get the blue to print. thought I had a bad cartridge and replaced it but still won't print blue. Black and other colors print fine.

[KrazyToad]

@Jimbotron1

Welcome to the HP Support Community!

I suggest you try cleaning the Printhead and check if that helps

• From the printer control panel, open the Setup menu.

• Open the Printer Maintenance menu.

• If necessary, open the Tools menu, and then touch Clean Printhead.

  A test page prints.

  

• Examine the test page.

  • If the print quality is unacceptable, touch Clean Again to continue the next level of cleaning. If necessary, repeat these steps for the third cleaning cycle.

    Note: If the printhead is badly clogged, it might require another cleaning cycle. If so, wait 30 minutes before you perform all three levels of cleaning again.

You can also refer to this Link: https://support.hp.com/in-en/document/c05076934

If the information I've provided was helpful, give us some reinforcement by clicking the "Solution Accepted" on this Post and it will also help other community members with similar issue.

[StephSK]

I am having the same issues with the black cartridges on my computer. I have tried to clean the printhead multiple times for the black, as all other colors are working. 

[KrazyToad]

@StephSK

Welcome to HP Community

If you have already performing the cleaning process and the issue persists, I suggest you contact HP Support for replacement cartridges
 

Click on this link - www.hp.com/contacthp/ and select your Country to get the Contact details for HP Support

Thank you

If the information I've provided was helpful, give us some reinforcement by clicking the "Solution Accepted" on this Post and it will also help other community members with similar issue.