I tried the solution of moving the cartridge head and it worked temporarily but not as a long-term solution. I finally brought ours to a repair shop, a bizarre solution in this day and age of replacements being cheaper than repairs. Sure enough, we s...
Batteryheadbill is my new hero. I tried the Canon suggestion first to no avail, and then saw Batteryheadbill's. It worked like a charm. Kudos to Canon for maintaining this website and to clever Canon product users for posting their suggestions.