Black ink cartridges for my HP OfficeJet Pro 6968 are not working
The black ink cartridges for my HP OfficeJet Pro 6968 are not working. I’ve made 3 trips to Staples [Providence, RI] for replacements. Each of them has the same problem. The color cartridges work, but not the black ink cartridges. I’m on my 2nd third replacement. The first two did not have ink in them at all.When I scan from the printer to my computer that works. When I send-to-print from my computer the print is faint gray. When I try to copy a type-written page on the printer the page comes out blank, white.