Unfortunately, HP didn't make this indicator very descriptive. Their product specification page for this printer states that the blinking Attention light, "indicates that the printer media input trays are empty, the print cartridge door is open, the print cartridge is missing, or other errors".
You've already changed the print cartridge and the light is still blinking, so you should take a look at the other conditions described such as an empty paper tray, open door, and so forth. You also will want to look for a paper jam or carriage jam. These are two very common errors that will result in a blinking Attention light.
HP.com does provide a web page that describes a specific problem associated with a blinking Attention light:
Job Stuck in Queue
See if any of these suggestions work out for you. If not, post back your results along with anything else that you've learned about the problem. Good luck.
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