HP 6978 does not print black. t copies all colors but black Errorsdoc » Questions » HP 6978 does not print black. t copies all colors but black 1.71K viewsAugust 13, 2018 0 Rudy (anonymous) August 10, 2018 0 Comments Our HP 6978 does not print black. it is a newly installed cartridge it copies all colors but black. If it does show some black it is barely visible venmartin Changed status to publish August 13, 2018 Add a Comment 0 Answers ActiveVotedNewestOldest Write your answer. Register or Login