I have a c1765nfw all-in one printer. A few days ago I noticed it was printing pretty light. I took the cartridge (black) out and shook it a few times. Put it back in the printer. I restarted the printer and the message came up that the cartridge was empty and needed to be replaced. I did not believe this as it is not that old. Nonetheless, I got a new cartridge and put it in the printer. Giving me the same message "Replace Cartridge."
What is odd is that there were no messages prior to this telling me the cartridge was low, etc.