Why is my HP printer not printing black when the ink is full?

If your HP printer isn't printing black despite having full ink, the printhead may be clogged or misaligned. Dry or blocked nozzles can prevent ink flow. Try running the printer's automatic printhead cleaning cycle. Also, ensure the cartridge is properly installed and the protective tape is removed. Outdated drivers or firmware might also cause issues, so update them. If problems continue, consider replacing the printhead or contacting HP support.
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