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Your printer head must be dirty and needs to be cleaned. Try going to your printer application and look for the option for maintenance. If you cant find it, you can go to control panel, printers and faxes, then double click on your printer model. It should take you to your printers menu, just look for the option to clean it. Print a test page after cleaning. If you still see lines, just repeatedly do the cleaning until you no longer see the lines. If it still doesn't work, you can contact HP.