Our PIXMA MG7120 has been working well for several months. We just replaced all the ink cartridges about a week ago, and it's been printing well for the first couple days. Then it started printing with white streaks. I've printed the same page 5 times, and it comes out EXACTLY the same each time. I've printed the nozzle test page, and the grid is perfect and all the colors are solid, except the Magenta, which is not printing at all. I've checked the ink cart, which is unwrapped correctly and inserted solidly.
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