Please make sure that all of the inks of your PIXMA G7020 are full of ink.
Next, please perform 2 deep cleanings:
Once the cleanings are complete, please print a nozzle check:
Compare your printout with the example on this page:
If your nozzle check is missing colors, please perform an ink flush:
Once the ink flush is complete, please perform another nozzle check.
Does your nozzle check now print correctly?
If so, please attempt to print from your computer.
If not, your PIXMA G7020 would require service. If your PIXMA G7020 was purchased less than a year ago, please contact one of Canon's Technical Support Representatives via phone or chat to obtain your in warranty options. To contact a Technical Support Representative, please use the link below:
If your PIXMA G7020 is out of warranty, you are eligible for Canon's Upgrade Program. This is for out of warranty units which have been diagnosed to require service, or for some reason are incompatible with a new or upgraded system. This option allows you a one-time opportunity to purchase a replacement product, discounted from the list price.
If you would like to take part in this option, please call our Sales Department at (866) 443-8002 Monday through Saturday, 9am to 9pm. Let them know you have been working with technical support and the Canon Upgrade Program was offered.