6978 printer won't print yellow

[96V]

My printer quit printing yellow about 18 months ago while the printer was under warranty.  I called HP and they went through a very long series of commands and got it fixed.  Last week, it started doing the same this again.  I have reset the printer, uninstalled and reinstalled it, downloaded the latewst software and drivers, etc.  Nothing seems to work.  Any ideas?

[Raj1788]

@96V

Welcome to HP Forums, 

This is a great place to get support, find answers and tips to your technical queries.

To provide you with an accurate solution, I'll need a few more details:

Are you using genuine HP Ink cartridge?

Is the copy working fine?

Any hardware change made in the printer?

Have you tried any troubleshooting steps on your own?

I suggest you do a Hard Reset

(1) Turn the printer on, if it is not already on.

(2) Wait until the printer is idle and silent before you continue.

(3) With the printer turned on, disconnect the power cord from the rear of the printer.

(4) Unplug the power cord from the wall outlet.

(5) Wait at least 60 seconds.

(6) Plug the power cord back into the wall outlet.

NOTE: HP recommends connecting the printer power cord directly to the wall outlet.

(7) Reconnect the power cord to the rear of the printer.

(8) Turn on the printer, if it does not automatically turn on.

The printer might go through a warm-up period. The printer lights might flash, and the carriage might move.

Wait until the warm-up period finishes and your printer is idle and silent before you proceed.

Clean the printhead

The printhead could be clogged, and you might need to clean the printhead several times to restore print quality. Use an automated tool from the printer control panel to clean the printhead.

   CAUTION: 

Never turn off the printer when ink cartridges are not installed. To avoid issues that require cleaning the printhead or that can damage the ink system, always replace ink cartridges as soon as possible, and always turn off the printer using the Power button.

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

2. Open the Printer Maintenance menu.

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

   A test page prints.

   

4. 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.

Align the printhead

Aligning the printhead can resolve errors with Test Pattern 3.

1. Load plain white paper in the input tray.

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

3. Open the Printer Maintenance or Tools menu.

4. Touch Align Printhead.

   An alignment page prints.

   

5. Wait until the page is out of the printer before you remove it.

Try to print.

Keep me posted,

Have a great day!

Cheers:)