I had a message saying to replace Cyan, Magenta and Yellow printheads so I replaced them all with in-date, genuine HP ones, it run a head alignment and still keeps saying "ATTENTION REPLACE PRINTHEADS!" I take them out, clean the contacts and replace and after a few prints, the errror returns. I also get an intermittent blur or slight ghosting on the odd line which make me think there is a firmware or trailing cable issue but I'm not sure. PLEASE HELP IF YOU HAVE HAD THIS ISSSUE BEFORE. Many thanks, Lea. (07973 523893) 
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