Have Epson Stylus Photo EX. Changed the colour cartridge (for an Epson original), but the new cartridge will not print (black still prints though) but it's not showing out of ink, so I assumed it faulty. Have tried to change it for another new one, but pressing the button merely sends the existing cartridge through the "charging" process and the head does not move to the replacing position. So I cannot change the cartridge and cannot print colour. Any suggestions anyone, thanks.