My Canon MP560 had streaks in the black ink and it was telling me the black ink was low, so I changed out both ink cartridges. The computer and printer both tell me the ink levels are full. But as soon as I did that and printed a test page things went down hill fast. Now when I print a test page, the crosshatch pattern on top does not print at all. I have checked the tape over the slit above the ink label, and that is not the problem.