There may be debris that is blocking the communication between the cartridge and the printer. Remove the cartridge and unplug the printer from the power supply. Take a little bit of rubbing alcohol on a cotton swab and wipe off the contacts on the cartridge as well as the contacts inside of the printer. Allow both to dry for a few minutes before plugging the printer back in and re-installing the cartridge. This should clear up any miscommunication between the two.
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