My old hp deskjet 5550 printer stopped printing black so I assumed it ran out of ink and I ordered a generic refill cartridge. The printer would not work if the "new" black cartridge was in but would work in color if I removed the black one. I stumbled across this thread and followed the directions and replaced the tape with the dots over the replacement cartridge tape and the printer now works with the black one in but no black ink comes out. I tried printing in black only but still it only comes out in color. By the way. I have pressed a damp with alcohol napkin to where the ink comes out and it does come out.