I have a three year old HP 2600n and it has not given me any problems in the past. In the last two weeks it has suddenly added 3-4 evenly spaced magenta checkmarks on the right of every page, including the demo, config and menu structure. I use a mac (os 1.5.5) so I have not found access to a tool box. Cleaning and reseting default has not helped.
Re: Printer adding magenta checkmarks on every page
After reading other solutions on the web site I decided to look into the hardware itself. It seems I have a faulty magenta cartridge. I do not know why the marks were coming out as perfect little check marks, but that is what threw me off- had they been smeared I would have guessed it was the cartridge right away.
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Just had almost exactly the same issue - except the Magenta was printing 2mm below where it should have been.
Went through all the recalibration menus multiple times and the factory restore etc. Then wondered about the toner cartridge. If the problem is just with the Magenta, maybe this is where the issue lies. The printer had remanufactured toners in it - all the others were fine. Went and found a new HP original magenta toner - printer did its default recalibration on startup and the config test page came out like new. Put the old one back in and problem reappeared.
Strongly suggest you try another toner cartridge - as I suspect the chip is to blame in some way.
I had a similar problem. See: http://www.fixya.com/PostQuestionTx.aspx?prdid=378544&ctgid=0&thid=1044936&type=2 Are you your replacement cartridge orignial HP? I also had your problem on my previous HP printer (don't remember the model #). And I had it cleaned a couple of times, replaced the magenta cartridge (but with remanufactured), and could not get rid of the magenta. I gave up and bought a new 2600n, but now I wonder if I had used original HP parts if the problem would have been solved.