I have a Dell A920 Printer that has decided to stop printing in color. I replaced the color cartridge twice and it still won't print. I wiped the contacts on both the cartridge and printer - still won't print in color. I swapped the black cartridge and color cartridge. Did not get any black and got a little bit of color. Swapped them back and got the black but no color. I'm at a loss and need to get some programs printed for my son's class. Any help would be greatly appreciated!