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?
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