Your issues sound very similar to the problem I am having except mine are all one color (red) - see pattern printing entry near yours. I replaced my yellow cartridge possibly around the time my issue started. Are you using refilled cartridges or new? A friend suggested the refilled cartridges may be the issue.
I just replaced two cartridges, cyan and magenta, and am now getting some strange cyan and magenta 'ticking' on pages printing with colour. I have been troubleshooting for a couple hours now. I do not have back-up cartridges to test with but I'm not sure how this would be an issue with both cartridges. Any help would be appreciated.
These are horizontal dashed 'lines', the dashes are about 1cm long and 1.5cm apart. I have an attached an image, hopefully the lines are visible.
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