I bought a bunch of black HP 564XL cartridges, and also a set of blue/yellow/cyan, because I was out of black ink. Test sheet printed without any black ink after replacing the black cartridges. Used the HP "printer doctor" and cleaned printer heads. Used online help and cleared printer cartridge vents. Test sheet still printed with no black. Replaced all 4 cartridges, and the test sheet printed.
1 hour later, black printing is faint and blurred. Test sheet doesn't print again. Cleaned printer heads, again. Aligned printer heads. I can only conclude the cartridges are bad?
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HP 564XL cartridges flawed
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