I have tried everything I see on the internet and HP site to get rid of the lines when I install new cartridges. I finally got it fixed last time after going through half the new cartridges testing it. Didn't think to make a note, didn't think it would happen AGAIN and I am so frustrated. Getting through to HP is a joke. I have spent hours and dollars on this and am ready to chuck the whole printer. Anyone? Please give me a tried and true answer, as I said, I have tried all the obvious and a lot of not so obvious choices, but apparently not the right one. Help!