I have a Photosmart 6510 All-in-one. I have been printing with it (printing IRS forms) until some of the forms were not coming out right. I checked ink levels and black was low. I bought a replacement, put it in, and the black wouldn't print at all. I did the HP Print and Scan Doctor and it just says to clean print heads and align cartridges. Still no black shows up. Also the cartridges will not align. So I returned the cartridge and bought another one but it still doesn't work. I sometimes get real faint gray where the black should be but that's it. I have also manually cleaned the cartridge connections and reset the printer. Any suggestions from this point?
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