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Main reason for HP Printer printing black line • Install the ink cartridge in the wrong way • Clogged the print heads • Faulty the printer driver • Printer & paper setting issues Above fulfill these conditions, then you find your printer is working fine. Resolve the issue HP printer is printing a blackline with manual ways Website: https://bit.ly/3ftveOl Blogs: https://bit.ly/2PKBCG2