Assuming that you are at home, and your broadband is supplied by a router? If you locate this, switch it off, switch off your printer and disconnect it from the mains. Wait 20 seconds. Switch on the router and wait till all the lights are lit indicating internet connection. Then switch on your printer and let it come to life. You will probably find at that point that it is working again.
If that doesn't work, are you using a laptop, iPad or phone? If you go into settings you can remove the printer and switch laptop/phone/ipad off and on again. You can reinstall the printer driver from the Canon website if you find your correct model on there. I would be surprised if one of those solutions doesn't work?