HP have updated their printers to outright ban 'non-HP' ink! They no longer shows the “can't guarantee quality” message, but instead cancels your print completely until you inset a HP ink cartridge.
Printer Blocked error when trying to print from Samsung Phon... - HP Support Community - 8381249
How to Fix HP “Printer Status Unknown” Error
HP printers still block third-party ink. These ones have a workaround | PCWorld
My printer keeps saying it's blocked check printer. 3j. I don't know
Warning to anyone who has a printer as millions 'blocked' unless they have pricey ink - Daily Record
How to Fix Common Printer Problems - Tech Advisor
Cartridge stuck on right with cartridges blocked from remova... - HP Support Community - 6715705
Amazon.com: HP OfficeJet Pro 9025e Wireless Color All-in-One Printer with Bonus 6 Months Instant Ink with HP+,Gray, Medium : Office Products
HP DeskJet 2700 All-in-One Printer series - Troubleshooting | HP® Support
HP firmware update blocks 'non-HP chip' cartridges - Electronics & Technology - Community
Fixing Paper Feed Issues | HP ENVY Inspire 7200, 7200e, 7900, 7900e Printers | HP Support - YouTube
Printer blocked message coming up on phone when trying to pr... - HP Support Community - 7076545
Check the Print Quality Settings to Resolve Print Quality Issues | HP Deskjet D1600 | HP - YouTube
How to resolve if HP Envy printer photo tray blocked? by 123hpcomenvy - Issuu
Indicated Cartridges Blocked For Containing Non-HP Chip - HP Support Community - 8229894
How can HP block me from using a cheaper printer cartridge? | Consumer rights | The Guardian
Indicated Cartridges Blocked for Containing a Non-Hp Chip Fix, Supply Problem, HP M254nw Printer - YouTube
How to Clean an Epson Printhead – Printer Guides and Tips from LD Products