Step 1 - Run a Nozzle Check 

Step 2 - Confirm that ALL nozzles are firing properly, If there are gaps, clean the printheads and reprint the nozzle check to check for a complete pattern.

Step 3 - Check that the media type selected when printing matches the media loaded in the printer

Step 4 - Check that the image quality is not set on a production or high speed print quality mode.  Quality should be on high or highest setting.