I had the same problem, after replacing both black cartridges. I solved the issue by running the print head cleaner. Below is the link to the instructions.
For Mac:http://www.usa.canon.com/consumer/controller?act=ModelInfoAct&tabact=SupportDetailTabAct&fcategoryid=238&modelid=17406
For PC: http://www.usa.canon.com/consumer/controller?act=ModelInfoAct&tabact=SupportDetailTabAct&fcategoryid=238&modelid=17406
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