To have a better understanding of your issue, please let everyone know the printer model you are using, and your operating system (Windows Vista/7/8 or Mac OS 10.X). That way, the community will be able to assist you with suggestions appropriate for your product.
Also, which software are you printing from, and what is the paper type being used?
Any other details you'd like to give will only help the Community better understand your issue!
If this is a time-sensitive matter, our US-based technical support team is standing by, ready to help 24/7 via Email at http://bitly.com/CanonEmail or by phone at 1-800-OK-CANON (1-800-652-2666) weekdays between 10 AM and 10 PM ET (7 AM to 7 PM PT).