If your Canon printer isn't working, perform Canon printer troubleshooting. Look for the following signs of trouble: - The ink tank was not properly mounted or fastened. It might also be low ink. - Misuse of the CD-R Tray for printed DVDs/CDs - There must be a connection problem. - You began printing with the back cover open. - The printer driver doesn't recognize it. - Misconfigured printer port (Windows)