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Depending upon what program or application you are printing from, there could be something wrong with the application - esp. if it is an Adobe product. Try printing a picture from something simpler, and see if it comes out without colored bands at the edges.
If the colored bands show up with *every* application, the printer may need re-aligning of the printhead - which is usually one of the Maintenance functions provided in the printer software distributed by the manufacturer.
Have you tried doing an Alignment? if not, I recommend it at this point.