I have a bjc 6000 and ran into the same error. For me the problem was the ink head, not the cartridge. the heads go bad and eventually the printer can not communicate with them and they need to replace.
Most inkjets, the heads are part of the cartridge. Cannon allows the ink tanks to be replace without having to replace the heads. But like I said, they eventually go bad.
Unfortuanately you don't know which head is bad. Since you say it prints black, I would suggest buying a color Head. They are availible just as readily as the color ink tanks.
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