Ink-jet cartridge or printhead problems.
Clogged Print head:
CLEANING SOLUTION: Buy any brand of ammoniated window cleaner. In North America that means either Windex original formula (not the new types or all surface types) or any generic "blue transparent" version but makes sure it has ammonia in it.
You may also use household NON-SUDSY ammonia and mix it one part ammonia to 9 parts water.
Once you have either the window cleaner or the diluted household ammonia, add about 8 parts of that liquid to 2 parts of isopropyl rubbing alcohol, either 70 or 99%, but make sure it is transparent, clear, isopropyl containing no additives such as skin conditioners or lanolin or other oils, or oil of wintergreen, etc.
There used to be a clean printhead option in tools, but it was not there as of 2016.
People frequently have problems with black not printing.
See Solved: Black not printing - HP Support Forum - 2926025
None of the solutions worked for me. I spent 40 min on the phone with HP and they told me the printer was broke and offered me a bad deal on a discontinued model.
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