What does it mean if the Power button light is blinking fast, and what should I do?

A fast-blinking Power button light indicates that either the ink access door is open or the printer is in an error state. If the ink access door is open, simply close it. If the door is already closed and the light continues to blink fast, check your computer or device for error messages, or try printing a page to generate an on-screen message. (Page 9)