I didn't buy it, it was given to me because it's owner couldn't get it to work.  I have no problem with the color but the black will not print.  I am pretty sure the black cartridge is not empty.  So before I try buying another cartridge does anyone know how I might be able to determine if it is actually a problem with the permenent print heads not lining up to the cartridge?  How can I tell if it is the machine or the cartridge?