Hi cinwallace,
First, it is recommended that you are using Canon ink.
Next, please perform 2 or 3 printhead cleanings:
1. Swipe the HOME screen and then tap Setup on your PIXMA MG7720.
2. Tap Maintenance.
3. Tap Cleaning.
4. Tap Yes to clean the printhead.
5. Tap Yes to print a Nozzle Check.
Does the Nozzle Check print correctly?
https://ugp01.c-ij.com/ij/webmanual/Manual/All/MG7700%20series/EN/BG/bg-maintenance1000.html
If it does not, your PIXMA MG7720 would require service. If your PIXMA MG7720 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:
https://mycanon.usa.canon.com
If your PIXMA MG7720 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.
To help you get up and running quickly, we also offer free standard shipping (if the order is completed by 12:30PM ET). If you would like to take part in this option, please call our Sales Department at (866) 443-8002 seven days a week, 8am to Midnight. Let them know you have been working with technical support and the Canon Upgrade Program was offered.
