I am running the ConeColor Pro system on the 3800. I recently purchased the 3800 from a gentleman who was not printing routinely. I do not know exactly how long it was sitting, but the old carts expired in 2012. I have managed to get it up and running with the latest nozzle check showing every color printing at 100% except the magenta. After several power cleans and alignment the magenta has shown the same missing dashes consistently, while the other colors all improved. I've read that the pigment in the magenta can be stubborn, could this be a damper issue? I am new to the printing world so any help would be greatly appreciated, thank you in advance for having a look at this!