Just checking! have you removed the protective cover from the cartridge?.
I've had similar but it seems to have righted itself. Try this don't just turn off the printer disconnect printer from the socket leave it off for about 10 mins plug back in and try again.
You could also try re-installing the printer program using the disc that came with it. I did this on another printer I had and it cured the problem, still don't know why it happened though.
bob
April 2007