Try cleaning the paper rollers and the print head.
Use a wet cloth to clean the paper rollers.
Use a little amount of water and some alcohol (Isopropyl alcohol) to clean the print head. (You may not need to do this if your printer cleans it automatically through software utility.
This may be also have caused by the low ink level. Replacing the cartridge should solve this problem.
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Mine is a HP 6210, but every 1st line in the paragraph is missing the top half, and in some paragraphs it's every other line. Cleaning the cartridge doesn't help. The ink level is supposed to be still 1/3rd full, so I hesitate to replace these $20 cartridges.
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