Issue with Black Ink not Printing after changing all Cartridges HP OfficeJet Pro 6968

[Cmetrose]

I just re enrolled into HP Ink again.  And I tried using the old cartridges that had nver been used and put them in the printer. I get color with no problem but the black ink is not printing. I cleaned the Printer Heads, realigned them, checked for clogs on the Ink itself, etc... I went ahead and put another brand new black ink in and did a test page, same issue. I get good testing on all the color inks, but the black one skips the darkest setting and I get 2 grey colors. I went through all of the troubleshhoting steps recommended.  I'm at a loss here. Any suggestions?

Thank You

[sabretooth04]

Try here.

https://support.hp.com/us-en/product/hp-officejet-pro-6960-all-in-one-printer-series/8289579/model/1...

Let us know.

[Cmetrose]

Thank You for your quick reply. I did 2 other printerhead cleanings and now on the test pageI can now start to make out the ABC in very faded black ink. I have to wait about 30 minutes to do another one. I went through and checked for clogs again but Im nt seeing anything on the black ink. The color part is bright and clear. Im uncertain if there is anything I can check internally on the printer to see if it can be cleaned by me or not.

Thank You