Just a thought, have you removed the tape on the top of the cartridge which allows the ink to flow, removing the tape allows air to be sucked through the cartridge.
Another thing you could do, is take all the cartridges out of the machine , remove the printhead from machine, then use a tissue and dab the bottom of the printhead, to see if ink is coming out. If not place ink cartridges on the printhead and place a vacuum cleaner hose on the bottom of the printhead and turn it on, this will force ink through the printhead. Dab Printhead again to see if any ink is there, if not try again. Place back in printer and try printing
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First thing, make sure the cartridge is seated properly. If so, try cleaning the print head. Normally if the other colors are good and the old black cartridge was working before if went empty try using the maint option and cleaning the print head it gets gummed up sometimes. Also look at the board on the cartridge/cartridge housing (the little gold connectors) and make sure none of them are damaged.
Select EconoFast or Draft as the print quality setting in the printer properties. This will prevent the color cartridge from being used.
- Or -
Try another color cartridge. The color cartridge is used to print grayscale images in Normal or Best print modes, so if one color has run out, the printout will have the wrong tint. With a full color cartridge, the colors can be properly combined to create a composite black.
When printing with Normal or Best as the print quality setting, the HP Deskjet 710C or 720C or 722C series printer will use the color ink to improve print quality output, even when printing a grayscale image.
Trying cleaning the contacts on the cartridge and clean the contacts on the printer use a
dry tint paper towel to clean the contacts. Then try to reinstall the cartridge using the
software. Try to print the self test. If failed try another cartridge if you dont get any
error then the cartridge might be defective.
Next, lets try to print the self test. Begin by disconnecting the power supply from the wall (not the back of the printer) for at
least "30 seconds." This is essential. Then plug the printer back in and follow these
steps: 1. Press the "Copy" button. 2. Press the "Menu" button. 3. Press the down arrow button once or until the screen displays "Maintenance." 4. Press the check mark button to select the "Maintenance" menu. 5. Press the down arrow button three times until the screen displays "Print Test Page." 6. Press the check mark button to select this. The Self-Test will start printing. The self-test should at least print out a set of either black or color bars, if not both
(if you have a printer with both color and black installed simultaneously.) Should this
test fail, try it again without cartridges installed. If the self-test still fails to take
paper in and make sounds like the carrier is moving across the paper, this is a hardware
issue, and the printer will require service. If the self-test completes without any
cartridges installed, run the self-test again with the color cartridge installed. (If you
have both black and color cartridges, after this test, run the test again with just the
black cartridge installed.) If you find that either cartridge causes the self-test to fail,
please let me know.
The cartridges may need to be cleaned by the printer. Check for this option on your user's manual, they will usually refer to it as a nozzle check/clean.
If the cartridge is clogged and does not unclog replace the ink cartridge. Contrary to what people might think these cartridges have a shell life and can be faulty out of the box.
Have you tried cleaning the print heads or replacing the color cartridge? where as it it printing black fine it leads me to believe the problem lies in the color cartridge. my first recomendation would be to run the clean print head wizard in the printer settings and if that does not work then replace your color cartridge.