You can do Canon Printer Troubleshooting by using these techniques to troubleshoot a Canon printer. 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.