Remove the Carts and re insert them.
Also download click here
the Epson utility- takes a bit of learning and the main window sets the printer model and the operating window is accessed by right clicking the lower task bar icon
Also try to obtain a 'Zap-It' from your ink supplier -these reset the cart's chips.
If you have a set of finished carts that did work.
prize off the chips and swap them colour for colour.
Also take a saunter through