What is the exact model of your printer (e.g. CB747A)? To locate this Product Number P/N: this document.
While waiting for this information, please follow the instructions in the HP link Black or Color Ink Not Printing, Other Print Quality Issues. The ink cartridges in your printer may be different, that's why I'm asking you for the exact model of the printer, but you can still follow the instructions in the link.
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