To do Canon Printer Troubleshooting, follow these methods. If your computer has ceased detecting your printer or the print queue has become unresponsive as a result of a software fault, try restarting it before attempting to print something new.Alternately, select Printers and Faxes from the Control Panel on your computer. Now, if your Canon printer isn't listed, click the Add A Printer button. Finally, adhere to the on-screen directions to have your computer attempt to detect the printer by running a test.