Printer Repair Questions? Ask IT Technicians for Answers ASAP
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Make sure the ink tank is square in the print head, then push on the top of the cartridge until you hear a click. You should then be able to remove the cartridge.
Or you can contact Canon US-based technical support team at http://canon.us/SupportCF
Unplug the unit and physically move the carriage to the center. Check that you have the proper cartridge and that it firmly installed. Plug in the unit and turn it on. Please let me know what happens.