Follow these steps to do Canon Printer Troubleshooting. If your computer has stopped recognizing your printer or the print queue has become unresponsive due to a software error, try restarting it before attempting to print a new document. Alternatively, you can access Printers and Fax from the Control Panel on your PC. If your Canon printer is not already listed, click the Add A Printer button. Follow the on-screen instructions to have the computer attempt to detect the printer by performing a test.