In order to do Canon Printer Troubleshooting, you can use the methods listed below. If your computer has ceased recognizing your printer or the print queue has been unresponsive as a result of a software fault, try restarting it before attempting to print something new. Alternatively, select Printers and Faxes from the Control Panel on your computer. Now, if your Canon printer isn't already listed, click the Add A Printer button. Final step: Have your computer run a test to determine if it can detect the printer by following the on-screen directions.