On startup, printer displayed Ink System has

I searched internet forums and found out how to reset the internal processor, thereby deleting the error message and allowing the printer to operate normally.
Process was:- Press on/off to turn off power. Unplug power cable. Wait 1 minute. Press and hold 'Red Eye Removal' and 'Print Photos' buttons. Insert power cable and printer automatically powers up. Keep holding the two buttons until the display screen goes blank. Press on/off to turn power off. Wait 1 minute. Press on/off to turn power on. Press 'Setup' on touchscreen and go through the procedure, including wireless setup (if used). "Bingo".