Printer issues

My Macbook Pro has stopped recognising my printer. I always plug in via USB, and it always works fine but it has suddenly stopped working: I get an error message to say printer is offline, but it's plugged in as normal and switched on. I've restarted both to no avail - anyone have any ideas? Also please note I basically know nothing about computers... Is there a way to try and re-upload the printer? I've got a Canon ip5200.