Turn off the machine using the power button, unplug the power cord from the back of the machine, remove the ink cartridges, wait 2 min, plug the power cord back in, press the power button to turn on the machine, wait until the printer prompts that the ink cartridges are missing, then replace the ink cartridges. If this doesn't fix the problem you may have to re-prime ink through the system. There are instructions for doing this at http://www.ccl-la.com/blog/index.php/hp-photosmart-ink-system-failure-1/.
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