I have tried:
nothing has helped. What can I do to fix this?
It looks like you have already tried the recommended maintenance options for the issue. You can also try removing the toner and then shaking it gently to make sure the toner is evenly distributed. If that does not resolve the issue, it looks like there is something wrong with the hardware. You can use the link HERE to access you My Canon account to check your service options or you can contact support at 1-800-652-2666.