I recently purchased the HP M251nw laserjet. I haven't printed much yet as I just got it, however, I notice that on the pages that I print out, on the left side there are blue dots all down the page. I don't have to print anything formal just yet, but I will be soon, so I need to figure out what is causing this. I did read up about the cyan cartridge. Since this is brand new, it's the HP toner and it's new. So I'm not sure what it could be.
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