Printer only printing Black & Yellow

[Harry688]

My HP Office JetPro 6978 is only printing black and yellow. The cartridges are full, new and genuine HP cartridges. I tried printing from multiple computers and all had the same issue. I tried unplugging the printer and reinstalling the cartridges, but it did not work.

[Jay_G24]

Hi @Harry688

Welcome to the HP Support Community. I'd be happy to assist you with the  "print quality" issue. 

To better assist you - 

1) Does the copy come out the same way? 

While you respond to that, let's print a Print Quality Diagnostic page -

1. Load plain white paper in the input tray.

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

3. Open the Reports or Tools menu.

4. Touch Print Quality Report.

Post the Print Quality Diagnostic page here so we can help you further. 

You may also refer to this document with steps to fix " Print Quality Issues" issue applicable for your printer -  Print Quality Issues

Also, try updating the printer's firmware - HP Printers - Updating or Upgrading Printer Firmware 

Hope this helps! Keep me posted. 

Please 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!

[Harry688]

Yes, the printer and copier both print the same way (black and yellow).

[Kumar0307]

@Harry688

If you have tried the steps and the issue persists, I'm afraid this is a hardware issue.

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

Keep us posted for any other assistance.

If you feel my post solved your issue, please click “Accept as Solution”, it will help others find the solution. Click the “Kudos/Thumbs Up" on the bottom right to say “Thanks” for helping!