I have a Canon S750 printer. I was using it yesterday and it was going OK except that it had started banding when it printed black. Then the yellow cartridge ran out, so I changed it and now all colours come out yellow. I just get black, white and yellow with perhaps a hint of the other colours if I'm lucky. I tried changing the cartridge again for another new one, but I still had the same problem. I've tried cleaning and deep cleaning numerous times. Please can someone suggest what I can do to correct it?