HP Officejet Pro 6978

[LRogers23]

I have a ink cartridge, 1 of 4, not working though is shows full.

I have changed the cartridge, cleaned the head, cleaned the sensors, etc. All of no help.

[Max3Aj]

Hi @LRogers23, Welcome to HP Support Community. 

Thank you for posting your query, I will be glad to help you. 
Since you've already tried changing the cartridge, cleaning the printhead, and checking the sensors without success, here are some additional troubleshooting steps to resolve the issue with your HP OfficeJet Pro 6978:

1. Check the Cartridge Vent

• Remove the problematic cartridge.
• Inspect the vent (small hole on top). If it's clogged, gently clean it with a pin or paperclip.
• Reinstall the cartridge and check if it works.

2. Perform a Deep Printhead Cleaning

• Go to the printer’s control panel.
• Navigate to Setup > Printer Maintenance > Clean Printhead.
• If the first cleaning cycle does not fix the issue, run up to three cleaning cycles.

3. Check for Printhead Failure

• Print a Print Quality Diagnostic Report:
  • From the printer menu, go to Setup > Reports > Print Quality Report.
  • Look for missing colors or faded sections in the report.
  • If a specific color is missing, it could indicate a printhead failure.

4. Reset the Printer

• Remove all ink cartridges.
• Power off the printer, unplug it from the power source, and wait 5-10 minutes.
• Plug the printer back in, turn it on, and reinstall the cartridges.

5. Update Printer Firmware

• Go to HP Support and check for any firmware updates.
• Install the latest update and restart your printer.

6. Try a Hard Reset

• With the printer powered on, disconnect the power cord from the back.
• Unplug it from the wall outlet and wait 60 seconds.
• Plug it back in and power it on.

I hope this helps. 

Take care and have a good day. 

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! 

Max3Aj

HP Support