The HP Printer has a 'chip" that can recognize a non HP refill. Simple solution: 1./ UNPLUG THE POWER CORD FROM THE PRINTER 2./ RECONNECT THE POWER CORD 3./ WHEN THE LIGHTS BEGIN TO FLASH, PRESS AND HOLD THE ON/RESUME AND PAPER SIZE BUTTONS ( I DID NOT HAVE PAPER SIZE BUTTON SO HELD DOWN THE ZOOM BUTTON 4./ WHEN ONLY THE ON/RESUME LIGHT IS FLASHING RELEASE THE BUTTONS. THANKS TO www.printenviro.com