Office Jet Pro 6978 only prints in black and blue.

[Patti_21]

Office Jet Pro 6978 only prints in black and blue. Magenta and Yellow went out at the same time.  I installed new cartridges, cleaned the printheads several times, and uninstalled and reinstalled the software.  There is no improvement. 

[Raj1788]

@Patti_21

I suggest you do a Hard Reset on the printer

(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.

If you have tried all the steps in this link: https://support.hp.com/in-en/product/hp-officejet-pro-6970-all-in-one-printer-series/8289585/model/1...

If the issue persists, I would personally suggest you contact our HP Support. 

Click here: www.hp.com/contacthp

Keep me posted, how it goes!

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Cheers:)