prob. after driver update HP 7520 printer
This is a seriously long shot but turning over all the stones.
I have an HP 7520 photosmart printer that is a few years old. It's quirky to say the least but that's not my issue right now. After being nagged to install scanner software, I relented and did.. despite the scanner working just fine. I don't notice any change in the scanner.
BUT
Ever since that update it has refused to PRINT the black ink cartridge, even with a new one. I've gone over all the trouble shooting steps that HP has on their support page, short of replacing the print head. And before I shell out $$ to do that or ditch this printer and get a better one I wanted to see if it could ... possibly... be an issue with the software update. Google searches don't come up with anything.
thanks..
MacBook Pro with Retina display, macOS Sierra (10.12.3)