Have you considered you're out of blue ink?
LOL!!!!! No, it's not the ink. Canon has see-through tanks and I have tons of ink on hand. I fill my own tanks. I wish you had been right, thought. I figured out ....finally. It's my printer heads. On both printers! What I did was borrow a print head from a friend's printer and put it on mine. It worked instantly. Now I have to figure out if I should buy two new printers or two new print heads. But first I'm going to try cleaning them out one more time. Thanks for chiming in, like I said, wish you had been right