Www officejet-support com - Office jet Pro L7580

My color cartridges for the printer work, but the black does not show up. I have even replaced the black cartridge even though it was barely used. What can I do to fix this problem?
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  1. I would try cleaning the printhead. Also, get in contact with HP support. They're pretty good about helping with these kinds of problems, and are willing to replace faulty equipment still under warranty.
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