I have viewed identical issues with every brand of inkjet printer - it's far from special to HP inkjets. Share this post Allow me to know irrespective of whether this functions in your case, and we can easily go from there. There's two treatments listed here - the initial is http://marcoebujw.fitnell.com/31374859/hp-photosmart-7520-one-or-more-cartridges-appear-to-be-missing-or-damaged-fundamentals-explained