Hi! I was given a new HP printer recently and printed almost 25 photos without problems. The printouts looked great in terms of colour & resolution. But suddenly, one of the images (landscape orientation) got printed with a white line running from one end of the print to the other. I tried printing another time & even another image, but got the same problem. The lines were at the same place, ie. almost halfway from the top of the image. After cleaning the area around the nozzle as well as some parts of the printer, the next print turned out perfect, but the subsequent prints had the same white line problem. What gives? I was using a newly bought cartridge. Has anyone had the same problem and solved it? Many thanks and happy cny!