First, are you aware Lexmark recently released a software update they deemed important for your printer? Here is the LINK to check it out, and see if this solves your problem. Also did you align your print heads?
Well I'm not sure because it will be software specific to your printer, but I suppose under Printers, if you right clik the printer, and go into it's properties, there should be an option to Align Print Heads. It may be under Cartridge Maintanence.
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