signifies that the printer is not able to recognize a compatible cartridge.
This can happen because of two reasons :
1. Your cartridges are bad.
2. Your printer's cartridge sensor has gone bad.
Please remove all cartridges. Using a moist cloth clean the golden contacts on cartridge as well as printer. DO NOT touch nozzle of cartridge. Dont insert the cartridge yet.
Please do this :
1. Remove the power cable from printer. Remove the USB cable that connects printer to computer (remove it from printer as well as computer's usb port)
2. Press the printer power button and keep pressed for 3 minutes then release
3. Now plug in the power cable and usb cable (connect printer to computer) and power on the printer.
Now insert cartridges and see if error goes away.
If not, then you will have to buy new genuine cartridge to confirm if its a printer issue or not.
Your best option is to buy genuine cartridge from a store where they take back open cartridges if they are defective. That way you can return them and save your money.
If error persists with new cartridge than it would be cheapest to buy a new printer if this one is more than 1 yr old and out of warranty.
Feel free to ask any question or concern you may have. I will be glad to help you.
Positive Feedback and BONUS are always appreciated.