https://community.usa.canon.com/t5/Desktop-Inkjet-Printers/How-does-one-print-using-a-usb-cable-on-the-mg6420/m-p/147455#M39450 As long as you already installed the drivers, when you plug in the USB cable it should automatically add a USB instance of the printer into system preferences (so, if you had the wireless version installed before, you would have 2 options now, MG6400 series and MG6400 series copy 1, or something similar). As long as you select the new instance of the printer you should be able to print via USB fine. Wed, 29 Jul 2015 18:16:36 GMT merrymary247 2015-07-29T18:16:36Z https://community.usa.canon.com/t5/Desktop-Inkjet-Printers/How-does-one-print-using-a-usb-cable-on-the-mg6420/m-p/147439#M39449 <P>My Internet connection is down...need to print for new employment! &nbsp;I'm using a MacBook Pro.</P> Wed, 29 Jul 2015 17:02:39 GMT https://community.usa.canon.com/t5/Desktop-Inkjet-Printers/How-does-one-print-using-a-usb-cable-on-the-mg6420/m-p/147439#M39449 Maryk999 2015-07-29T17:02:39Z https://community.usa.canon.com/t5/Desktop-Inkjet-Printers/How-does-one-print-using-a-usb-cable-on-the-mg6420/m-p/147455#M39450 As long as you already installed the drivers, when you plug in the USB cable it should automatically add a USB instance of the printer into system preferences (so, if you had the wireless version installed before, you would have 2 options now, MG6400 series and MG6400 series copy 1, or something similar). As long as you select the new instance of the printer you should be able to print via USB fine. Wed, 29 Jul 2015 18:16:36 GMT https://community.usa.canon.com/t5/Desktop-Inkjet-Printers/How-does-one-print-using-a-usb-cable-on-the-mg6420/m-p/147455#M39450 merrymary247 2015-07-29T18:16:36Z