Today my black ink cartridge decided to be a bad boy and stop working. I have gone though most of the help stated here on the forum, but with no results so far. First I ran some diagnostics on my imac, ran the cleaning program on the utilities page a couple of times, cleaned the cartridge with a cotton swab in the way descibed by the heroes on the forum, waited a while, and ran the cleaning program again; all with no result whatsoever. The cartridge is still over half full and the guarantee period runs until jan 19th 2020. Is there anything else I can do, or could I please get a cartridge that works?