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check your ink levels. if its the ink that came with the printer it is probable running out of ink. they do not give a full cartridge with printers, only about 3rd full. also try cleaning the heads. and try changing your printer settings/prefrences to less ink, more drytime see if that helps.
Most likely you have a defective black toner cartridge. Open the front shutter on the black toner and look at the drum. If you see the drum has toner on it corresponding to the line down the page, you found the problem. If you can't see anything on the drum try printing a page and then interrupting the printout while the page is still in the printer. If you see the line on the page before it goes through the fuser, (the last roller thing on the top of the printer) then it still is the toner cartridge. If it occurs only after the fuser then it, the fuser, is at fault.