@Nick Marques, you have lots of things going on at the one time, so just to start from the beginning, can you post the latest nozzle check, so we can see the state of current play with your printer.BTW - I'm new to this printer's maintenance, but not new to Canon printers. I've had lots of them..
Do you mean that both printers were new in the box, or was one used with the cartridges already installed in the printer?I bought two PRO-1 for very low price may be 2 years ago and let them sleep in garage. At the beginning of this week, I did try to wake one of them up. It had original Canon ink cartriges in it.
@Yeenya, to start with, you should never run any test prints on the printer till you can first get a perfect nozzle check, and only run normal cleaning cycles, no deep cleans, that just wastes ink.Question at the end. Do you think, there is a chance to get the second printer as well fully working, make the black work? Or I shall keep it just as "spare part"