Use these techniques for Canon Printer Troubleshooting. Before trying to print something new, try restarting your computer if it has stopped recognizing your printer or the print queue has stopped responding as a consequence of a software error. Alternatively, choose Printers and Faxes from your computer's Control Panel. Now click the Add A Printer button if your Canon printer isn't already listed. Finally, follow the on-screen instructions to have your computer conduct a test to see if it can detect the printer.