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I have magenta smears on the left side of most pages.  I've run the cleaning routines with no help. I'm willing to buy a new magenta cartridge if that has a good chance of fixing the problem, but I don't want to just throw money at it. Should I buy a...

When I first posted this question, I thought that the problem was limited to printing in landscape orientation, which is described below.  I've since discovered that it happens in portrait orientation too.  That is, about the top 15 or so lines on th...