I have an iMac that was connected by USB to the Canon MP620 printer and worked well for over a year. I had to replace my router and installed a new Airport extreme. In doing so I have messed up the printer settings. Currently the printer is linked to the computer directly. I have removed and reinstalled the printer driver etc... But when I try to add the printer it won't show up in the list. I have tried allowing access by getting rid of the firewall but the printer still does not show up. I am clearly in over my head so if anyone can help I would appreciate it.