There is a chip on your cartridge that communicates with the printer to estimate how much ink is left in the cartridge. When the chip thinks the cartridge is empty it will refuse to print any more pages no matter how much ink is left in the cartridge. These cartridges are only estimated to print "up to 840 4" x 6" photos, or 80 13" x 19" photos." If it showed half full yesterday and then you put through a large print job it is very likely the cartridge is empty. In any case once the chip thinks it's empty the cartridge needs to be replaced.
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