Black color block is missing on 'Print Quality Diagnostic'

[GJLloyd]

The Print Quality Diagnostic goes not print any of the black block, yet the black text prints fine and the blocks have nice sharp black borders.  I have thoroughly cleaned the print heads.  Priming a simple text document produces a blank page.  Has HP put in some firmware to prevent printing using non HP Inks.   I am led  to believe this is the case - which is illegal in Europe as I understand things.  

Can HP advice me how to get this printer working with black ink - how can it be selectively printing black?

[Betty0610]

@GJLloyd

Welcome to the HP Support Community.

Are you able to copy well in black?

Try the steps from here: https://support.hp.com/in-en/document/c03954004

Let me know if this helps.

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Thanks!

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