I happened upon the same issue in an earlier discussion (http://h30434.www3.hp.com/t5/Printer-All-in-One-Install-Setup/Deskjet-F4480-black-cartridge-full-yet-doesn-t-print-black/td-p/603201) and found a solution which worked for me. In brief, the problem was dried ink in the cartridge nozzle, which can often be solved by soaking the bottom of the cartridge in about a quarter inch of hot water for a minute or so. The cartridge can be tested in the printer after a careful drying. Sometimes the process has to be repeated a few times.
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