I have a HP deskjet, ive had it for over a year and i use it atleast one a week. Last weeek i installed some new cartiges and they all print out in colour expec black. So i thought it was a faulty black cartrige and bought a single black ink. Still no black ink printing out. Ive cleaned out the printheads, etc. i NEEED IT TO WORk!

Was the ink HP ink, or 3rd party?

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