HP 6978 no longer prints blue

[Nana72353]

My printer no longer prints blue. It comes out as brown or any shade but blue. I cleaned the print heads and did everything suggested. I have put in new cartridges since it started and they come from HP so that is not the issue. Also today when I printed a test page a couple of the horizontal lines are missing and it could not be fixed. I purchased it in 2019 from HP directly. This is my home printer and it doesn't get heavy use.

HP Officejet Pro all in one 6978

[A_Gayathri]

Hi @Nana72353 ,

Welcome to The HP Support Community.  

Thank you for posting your query, I will be glad to help you.

I understand you've already taken several troubleshooting steps. Here are a few more things you can try to address the issue of your HP OfficeJet Pro 6978 not printing blue correctly:

Check Ink Levels: Ensure that the blue ink cartridge has sufficient ink. Sometimes, despite being new, cartridges can have issues.

Clean Print Heads Manually: Sometimes automated cleaning may not be sufficient. You can manually clean the print heads:

• Remove the blue ink cartridge.
• Moisten a cotton swab with distilled water.
• Gently wipe the copper contacts on the cartridge and inside the printer where the cartridge sits.
• Let it dry for a few minutes before reinserting the cartridge.

Run Print Quality Diagnostic: Your printer might have a built-in diagnostic tool to check and improve print quality. This can usually be accessed through the printer's control panel or via the printer software on your computer.

Update Printer Firmware: Ensure your printer has the latest firmware installed. Sometimes firmware updates can resolve print quality issues. Update the firmware on an HP printer

Check Printer Settings: Verify that the printer settings on your computer are correct. Ensure that they match the type of paper you are using and that color settings are appropriate.

Print a Test Page: Use the printer's control panel to print a test page directly from the printer itself. This can help determine if the issue is with the printer or the connection to your computer.

Refer to this document: HP OfficeJet Pro 6978 All-in-One Printer User manual

I hope this helps. 

Take care and have a good day.

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