You may receive the following message when installing your cartridge. Just click the "OK" button on the screen. This is just a message Canon has made to try and make you buy only brand new cartridges. This screen will only appear when you first install the cartridge. The cartridge will still print fine.
When the next screen below appears, hold down the paper feed button of the printer until the printer responds. Then push the "OK" button.
Your ink level indicator may show your cartridge to be empty, but it is not. You will know when you run out of ink by when your cartridge no longer prints ink on the paper. If your machine asks you if you are installing an old cartridge or a new cartridge, please tell it "New."