when I first had my lexmark printer (different model no. to yours though) I had a similar message come up & I had put one of the leads one goes from the mains to the printer & the other one - this is the one I had wrong! goes from the back of the printer to the usb port on my laptop. There were two gaps it could have fitted into on the back of the printer & once I swapped it round, it worked fine. sorry if this sounds a bit confusing but its not easy to put it into words!!! anyway, hope this helps
patricia
September 2008