Having to support thousands of printers while I was working I have had my hands in more than my share.
Here is a tip for a dry cartridge. Take the color cartridges out and get a old rag. Wet the rag so that it is damp. Now rub it over the ink port on the cartridge. All HP ink is water solvable so it will remove any dried ink. You may have to try this a few times and your mileage will very. I have had some that worked first time and others that were so dried and caked up the needed to be replaced.
VG
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