HP 6978 will NOT print yellow or red and blue streaks

[Avsfan22]

My OfficeJet 6978 is not printing anything from the magenta or yellow cartridges (yes, I have replaced them with brand new HP Ink) and any blue prints very pale with streaks! I don't print that often so cleaned the print heads a couple times, bought all new cartridges and still same!

What the heck is going on???

[Anand_Andy]

Hi @Avsfan22,

Welcome to the HP Support Community

I understand you are facing a print quality issue with your HP Officejet Pro 6978 printer. Not to worry I will help you to get a resolution to resolve the issue.

To assist better:

• Does the copy print out the same way? 
• What's the application you are trying to print from? Have you tried printing from a different application or device? 

While you respond to that, let's print a Print Quality Diagnostic page -Post the Print Quality Diagnostic page here so we can help you further. 

You may also refer to this document with steps to fix the " Print Quality Issues" issue applicable to 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 “Accepted 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!