After refilling these cartridges, the printer will still recognize the cartridges as empty or low on ink. You can either replace the chips, or bypass the chips by pushing the reset button on the printer for 5 seconds. If your printer model doesn't have a "Reset" button then look for either "Stop", "Cancel", or "X". On some models holding down the right arrow key on the display for 5 seconds will let the printer function again. (This does not reset the chip back to full, it just allows the printer to print again) Note: This cartridge has a chip that knows its manufacturer date. It lets the cartridge operate and be refilled for two years then it will stop working. If the cartridge sat on a shelf for 6 months before you bought it then you only have 18 months to use it and refill it as much as you want.