What should I do if the Printhead Alert light and Error icon are blinking?

If one printhead icon is blinking, the corresponding printhead may be missing, installed incorrectly, or still have orange plastic tape or a plug on it. Remove the printhead, ensure no plug or plastic tape remains on it, and reinsert it securely. Important: do not open the printhead latch if the printheads have already been primed with ink, as this can cause permanent damage to the printheads. (Page 11)